Top 10 Algae Eaters vs. Amano Shrimp for Planted Tanks in 2027

1Amano Shrimp

Amano Shrimp take the top spot because no other cleanup crew member matches their appetite for algae without damaging plants. Growing to about 2 inches, a single shrimp can strip a leaf coated in hair algae or diatoms clean within a day, and a group of six to ten easily maintains a 20-gallon planted tank. They tolerate a wide pH and temperature range, ship well, and typically cost $3 to $5 each at local fish stores.

They are for anyone running a planted tank who wants algae control without a bioload spike or uprooted stems. The trade-off is they rarely breed in freshwater, so a die-off means rebuying stock, and they can vanish during tank lid gaps since they are strong jumpers. Compared to every entry below, they eat more algae per shrimp with zero plant damage, which is why they outrank even the best fish options.

2Nerite Snail

Nerite Snails rank second because they clear the hard, crusty green and brown algae films that Amano Shrimp mostly leave behind on glass, rocks, and driftwood. Species like the zebra nerite and horned nerite stay under 1 inch, graze constantly, and cannot reproduce in freshwater, so populations never spiral out of control. They cost about $3 to $4 each and survive comfortably in tanks as small as 5 gallons.

They suit keepers who want diatom and film-algae control on hardscape rather than on plant leaves, which is their main limitation compared to Amano Shrimp. Their eggs are white dots that stick permanently to surfaces and never hatch in fresh water, which some owners find cosmetically annoying. They eat less soft algae off plant leaves than shrimp, but they clean glass and rock faster than any other entry on this list.

3Otocinclus Catfish

Otocinclus Catfish rank third for their ability to graze soft brown diatoms and biofilm directly off broad-leafed plants like Amazon swords and Anubias without shredding the leaf tissue. They stay small at 1.5 to 2 inches, are peaceful schoolers best kept in groups of six or more, and need an established tank with existing algae and biofilm to eat, since they often starve in sterile setups.

They are for planted-tank keepers with broad-leaf plants and a tank that has been running for at least two months. Unlike Amano Shrimp, they cannot handle stringy hair algae or black beard algae, and they are sensitive to poor water quality during shipping and acclimation, with higher early mortality than shrimp or nerites. They outperform Amano Shrimp specifically on soft diatom films clinging to plant leaves.

4Siamese Algae Eater

Siamese Algae Eater ranks fourth because it is one of the only common species that reliably eats black beard algae and hair algae, two types most shrimp and snails avoid. It grows to about 6 inches, needs a 20-gallon or larger tank, and does best in a group of four to six to reduce territorial squabbling among individuals as they mature into adulthood.

This fish suits keepers battling an established black beard algae outbreak that Amano Shrimp have failed to control. The trade-off is a larger footprint, more waste, and a fish that can turn semi-aggressive and stop eating algae once well-fed on flake food. It ranks below Otocinclus and Nerite Snails here mainly because of its larger tank and bioload requirements in a planted setup.

5Bristlenose Pleco

Bristlenose Pleco ranks fifth for steady algae grazing on glass, driftwood, and hardscape, growing to about 4 to 5 inches and living 5 to 10 years in a well-maintained tank. It readily eats green spot algae and soft films and is far less destructive to plant leaves than common plecos, making it one of the few pleco species safe for planted aquariums.

It suits keepers who want a long-term, low-maintenance algae grazer and don't mind a larger bioload than shrimp or snails produce. It needs driftwood in the tank for digestion and supplemental algae wafers once tank algae runs low, unlike Amano Shrimp which forage more efficiently on less food. It ranks below the Siamese Algae Eater because it targets surface algae rather than the tougher black beard variety.

6Cherry Shrimp

Cherry Shrimp rank sixth because they eat biofilm and soft algae well but noticeably less aggressively than Amano Shrimp, making them a supplemental cleaner rather than a primary algae control solution. They stay under 1.5 inches, cost $2 to $4 each, and breed prolifically in planted tanks, often building a self-sustaining colony within a few months of introduction.

They are for keepers who want an algae-eating population that multiplies on its own rather than needing restocking, unlike sterile-breeding Amano Shrimp. The trade-off is weaker algae consumption per shrimp and a population that can overrun a small tank if unchecked. They rank below Bristlenose Plecos here because their algae appetite is lighter, even though their breeding makes them more self-sustaining long term.

7Ramshorn Snail

Ramshorn Snail ranks seventh for eating soft algae, biofilm, and leftover food, helping keep planted substrate and glass cleaner between maintenance sessions. They stay under an inch, reproduce hermaphroditically at a rapid pace, and cost next to nothing since most hobbyists get them as accidental hitchhikers on new plants rather than buying them.

They suit keepers who don't mind a population that can explode without predators like assassin snails or loaches to control numbers. Unlike Amano Shrimp, they do almost nothing against hair algae or black beard algae, and overpopulation is a common complaint in planted tanks. They rank below Cherry Shrimp because their algae-eating contribution is minor compared to the bioload and nuisance risk they add.

8Malaysian Trumpet Snail

Malaysian Trumpet Snail ranks eighth mainly for substrate aeration and detritus cleanup rather than visible algae control, since they burrow through substrate at night and surface-graze only lightly on algae films. They stay under an inch, are nearly impossible to eradicate once established, and reproduce live young without needing a mate present in the tank.

They suit keepers who want substrate turnover to prevent anaerobic pockets in a planted tank more than they want algae removal, which is where they differ most from Amano Shrimp. Their nocturnal habits mean they are rarely seen, and their population can become a visible nuisance crawling on glass at night. They rank below Ramshorn Snails because their algae-eating impact is even smaller.

9Florida Flagfish

Florida Flagfish ranks ninth because, while it is one of the few fish willing to eat hair algae and black beard algae, it is semi-aggressive and prone to nipping soft plant leaves and fish fins once algae supply runs low. It grows to about 2.5 inches and needs a 20-gallon or larger tank with plenty of open swimming space.

It suits keepers battling severe hair algae who are willing to accept aggression risk toward tankmates and delicate plants. Unlike Amano Shrimp, it cannot be trusted around slow-moving fish or fine-leafed plants like Rotala once it runs out of algae to eat. It ranks below Malaysian Trumpet Snails here because its aggression makes it a poor fit for most peaceful planted community tanks.

10Twig Catfish

Twig Catfish ranks last because, despite grazing soft algae and biofilm off driftwood and leaves, it is the most delicate and demanding species on this list, requiring pristine, well-oxygenated water and an established tank with continuous soft algae growth to survive. It grows to 4 to 6 inches and frequently starves in tanks without enough natural food.

It suits only experienced keepers with mature, algae-rich planted tanks and stable water parameters, since shipping stress and inadequate food supply cause high mortality rates. Unlike Amano Shrimp, which thrive in a wide range of setups with minimal fuss, Twig Catfish need near-perfect conditions to justify the effort. It ranks lowest here because its care difficulty far outweighs its algae-eating contribution for most planted-tank owners.

How we ranked these

We ranked each species by how much of the tank's actual algae problem it solves: diatoms, green spot algae, soft green film, biofilm on hardscape, and light hair algae. Bioload per inch, minimum tank size, temperature range, and compatibility with soft-leaved plants and shrimp-safe dosing were weighted alongside real-world availability and price at LFS and online retailers, since a great algae eater nobody can buy is useless.

We ignored breeding difficulty — amano shrimp need brackish water to raise larvae, irrelevant to their day job as algae crews — along with color morphs, aesthetic preference, and rare imports few stores stock. We also excluded aggressive or destructive algae 'solutions' like chemical dosing and UV sterilizers, since this list only covers biological grazers people actually stock in a living planted tank.

What to look for

The real decision isn't algae eater vs shrimp — it's tank size and bioload tolerance. Amano shrimp are the safer default for nano tanks under 10 gallons since they eat more algae per body size and add negligible waste, while fish like otocinclus or bristlenose plecos need more established biofilm and better filtration. Buyers who add fish algae crews to brand-new tanks starve them within weeks.

The most common mistake is buying one algae eater and expecting it to solve every algae type — amano shrimp barely touch black beard algae, while Siamese algae eaters are one of the few species that actually eat it. Match the species to the algae you have, not the other way around, and always add algae crews after algae is already visibly present, never before.

Related questions

Do amano shrimp eat black beard algae?

Not really — amano shrimp graze soft green algae, diatoms, and biofilm well but largely ignore black beard algae (BBA) once it's established. Siamese algae eaters and true SAE fish are the more reliable biological control for BBA. Amano shrimp are best used as general cleanup crew and hair-algae control, not as a dedicated BBA solution in a planted tank.

How many amano shrimp per gallon for algae control?

Most keepers stock 1 amano shrimp per 5-10 gallons for maintenance grazing, or up to 1 per 2-3 gallons for an aggressive initial algae cleanup during tank cycling. Overstocking beyond that risks starving them once algae is under control, since amano shrimp don't reliably breed in freshwater to self-regulate their population.

Can amano shrimp live with otocinclus catfish?

Yes, amano shrimp and otocinclus are one of the most common algae-crew combinations in planted tanks. Both are peaceful, similar in size, tolerate the same soft, slightly acidic water, and target overlapping but not identical algae — otos favor diatoms and soft films on glass, amano shrimp forage broader surfaces including plant leaves and substrate debris.

What is the best algae eater for a shrimp-only tank?

Nerite snails are the top pick for shrimp-only tanks since they're completely peaceful, can't breed in freshwater (no population explosion), and eat diatoms, green film, and soft algae without competing for the same food as cherry or amano shrimp. Ramshorn and trumpet snails work too but breed rapidly and add bioload.

Do amano shrimp eat live plants?

Amano shrimp rarely damage healthy, established plants but will nibble soft, decaying, or dying leaves and can shred delicate species like red root floaters or tender new growth when hungry. In a well-fed, well-planted tank this is negligible; in an algae-starved tank with few other food sources, amano shrimp become more opportunistic.

Are Siamese algae eaters better than amano shrimp?

For black beard algae specifically, yes — true Siamese algae eaters are the most reliable biological control available in the hobby. But they grow to 6 inches, need a 20+ gallon tank, and become less interested in algae as adults. Amano shrimp stay small, work in nano tanks, and cover more algae types overall.

How long do amano shrimp live?

Amano shrimp typically live 2-3 years in a stable, well-maintained planted tank, sometimes longer with consistent water quality and low copper exposure. Since they don't reproduce in home aquariums, a tank's amano population only declines over time, so most keepers restock every year or two rather than expecting a self-sustaining colony.

What algae won't any algae eater touch?

Blue-green algae (actually cyanobacteria) and severe staghorn algae are avoided by nearly every algae eater, including amano shrimp, otocinclus, and Siamese algae eaters, because both taste bad or are toxic to grazers. These require manual removal, blackout treatment, or targeted dosing (erythromycin for cyanobacteria) rather than a biological algae-eating solution.

FAQ

Is amano shrimp the best overall algae eater for planted tanks?

Amano shrimp rank among the top all-around choices because they're peaceful, small, plant-safe, and eat a wide range of algae types including hair algae, which few other species touch effectively. They're not the single best against every algae type, but for general-purpose maintenance in a community planted tank, they're consistently a top pick.

Can algae eaters replace manual algae removal?

No — algae eaters supplement but don't replace manual maintenance. They control ongoing algae growth, but an established heavy outbreak (thick hair algae mats, cyanobacteria sheets, or staghorn clumps) needs manual removal, a blackout period, or nutrient/light correction first. Add algae crews after the initial cleanup to maintain, not to fix an existing crisis.

What's the difference between amano shrimp and cherry shrimp for algae control?

Amano shrimp are larger, more voracious algae grazers, and better at controlling hair algae, but they don't breed in freshwater. Cherry shrimp are smaller, eat mostly biofilm and soft algae, and breed readily, building a self-sustaining colony over time. For heavy algae control choose amano; for a permanent, low-maintenance shrimp population choose cherry.

Do algae eaters need supplemental feeding?

Yes, once algae is under control most algae eaters — amano shrimp, otocinclus, nerite snails — need supplemental feeding with algae wafers, blanched vegetables, or biofilm supplements. Relying on algae alone to feed them long-term leads to starvation, which is one of the most common preventable algae-crew deaths in planted tanks.

Are amano shrimp safe with betta fish?

Generally yes for adult amano shrimp, since bettas usually can't fit them in their mouths, but individual bettas vary and some will harass or kill even large shrimp. Introduce with caution, provide dense plant cover for the shrimp to hide in, and watch closely for the first week before assuming the pairing is safe long-term.

What tank size is minimum for a mixed algae-eater crew?

A 10-gallon tank comfortably supports a small mixed crew — a few amano shrimp, 2-3 nerite snails, and 3-6 otocinclus (kept in a group, since otos are shoaling fish that stress and die alone). Siamese algae eaters and bristlenose plecos need at least 20 gallons due to their adult size and waste output.

Why did my amano shrimp die after a water change?

Amano shrimp are highly sensitive to sudden shifts in temperature, pH, and especially copper content in tap water or medications, all common causes of post-water-change deaths. Use a dechlorinator rated for heavy metals, match new water temperature closely, and avoid copper-based fertilizers or medications in any tank housing amano or other shrimp species.

How fast do amano shrimp clear algae compared to fish?

Amano shrimp typically clear soft algae and biofilm faster than most algae-eating fish because they forage constantly and can access tight spaces between plant stems and substrate that fish avoid. A group of 6-10 amano shrimp can visibly reduce diatom and soft green algae in a 20-gallon tank within one to two weeks.

Do nerite snails outperform amano shrimp on glass algae?

Yes — nerite snails are widely considered the single best species for scraping diatoms and green film off glass and hardscape, outperforming amano shrimp on flat, hard surfaces. Amano shrimp are better on plant leaves, substrate, and decor crevices, so many planted tanks combine both species rather than choosing one exclusively for full surface coverage.

Sources

• https://en.wikipedia.org/wiki/Caridina_multidentata
• https://en.wikipedia.org/wiki/Otocinclus
• https://en.wikipedia.org/wiki/Neritidae
• https://www.fishkeepingworld.com
• https://www.aquariumcoop.com
• https://www.seriouslyfish.com
• https://www.practicalfishkeeping.co.uk

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