The Siamese algae eater (Crossocheilus oblongus) is a more gregarious and tolerant cyprinid that ranges up to Template:Cvt. It is one of the only fish that will graze on "black brush algae" (freshwater Rhodophyta, or red algae), but even so will eat anything else in preference.
American-flag fish, Jordanella floridae, are also dependable algae-eating fish. They are one of the only fish to graze on black brush algae, as with the siamese algae eater, and will also indiscriminately graze on other algae such as diatoms and hair algae. However, like all pupfish, they can be nippy to fish smaller or slower than them. Males can also be territorial.[3]
Some of them belong to the genus Palaemonetes (grass shrimp)
Snails
Most species of freshwater snails, discounting most adult specimens of species belonging to the family Ampullariidae, which primarily subsist on aquatic plants as adults.
There are several saltwater fish species that eat algae. Two of the major algae eaters are blennies and tangs. These fish eat red slime algae, green film algae, and hair algae. Some of the known species are as follows:
Hermit crabs and other species of crabs eat algae. Crabs eat green algae, film algae, red slime algae, diatoms, cyanobacteria, and microalgae. Some of the known species are:
All species of sea urchin eat algae. They eat all sizes of algae, from something as small as macroalgae to something as large as kelp, and have been known to eat Coralline algae.[9] In cooler waters, sea urchins have even been known to eat enough to control the size and compositions of kelp forests. Sea urchins act as scavengers and will also eat dead algae that they find. Some sea urchins, such as the variegated sea urchin or the red sea urchin, have become popular as pets for home aquariums because of their ability to proficiently eat algae.[10]
Snails
Snails are known for eating hair algae, cyanobacteria, diatoms, green film algae, brown film algae, and detritus.[11]