Algae Eaters for Freshwater Tanks

A freshwater fish tank can be kept cleaner by including algae eaters in the livestock. These gentle fish should not harm their Guppy or Anabantoidei tank mates, but will work to keep the algae under control. However always consult the pet shop owner or a marine biologist before mixing fish, especially with aggressive types like the Green Terror. Not all algae eaters are the same. The size they grow to varies, as does the type of algae they eat. Choosing the right species for your tank will allow you to keep your tank in better balance for happier fish.

Plecostomus (image left)

These sucker-mouth fish are the most easily recognized algae eater. There is a smaller version and a larger version. When buying them for small tanks, be sure to get the smaller version that will stay under 4" long.

These would include the "bristle-nose plecostomus" and the "clown plecostomus". Plecos are nocturnal fish, and hiding places should be provided to keep them comfortable. They also prefer a stronger current. When buying a plecostomus, be sure to find out which species it is and how large it will get. The common plecos can grow up to 60 cm, making them far too large for small fish tanks.

Black Mollies

Most people don't realize that these attractive fish are actually algae eaters. They are inexpensive, readily available, and eager to eat the algae. The downside of black mollies is that they are also happy to eat flake food, and then they won't do quite as good a job on the algae.

Otocinclus

Commonly called a catfish, these fish stay small. They only grow up to 5 cm, and have a peppered body that makes for an attractive addition. They don't care for fully grown algae, but will regularly clear young algae off plant leaves.

Siamese Algae Eater

Otherwise called the Crossocheilus siamensis, this fish will eat black brush, or red, algae. They can be hard to find in the United States, although they will do a great job if you can get them. They eat brush algae that most other fish won't touch. They will also take care of any flatworms in the tank. They can get territorial with each other, so it's best to have just one per tank, unless you have a very large tank. They will eat algae from plants and decorations, but a good lid is required to prevent them from jumping out to an early demise.

Amano Shrimp

This little scavenger will take care of algae, dead plant debris, and leftover food. They eat constantly while staying below 5 cm in size. They are social animals, and do well is groups of three or more. Live plants that are in tanks with shrimp should only be fertilized very lightly, as the fertilizers typically contain copper and can harm the shrimp.

Snails

Snails are an excellent addition to your tank. They will not attack plants, and are experts at cleaning away the stubborn green algae, as well as green beard algae. Examples of snails include the Nerite Snail, Ramshorn Snail, and Malaysian Trumpet Snail.

Regardless of the algae eater you add to your tank, you are sure to be pleased with both the increased variety of livestock and the extra help with algae control. Keep in mind, however, that no algae eater is a replacement for regular tank care. Regular maintenance and water changes will still be required to keep the tank healthy and clean. Adding algae eaters, however, will help you keep up with that task.