Ritz yes some animals will eat the algae as quick as a grows. But they will never eliminate the algae, they are grazers so they will not completely wipe out their food source. If you work at eliminating the food source of the algae the algae will fadeaway and not return. It is a hell of a lot easier than to try to eliminate five to 10% at a time.While I agree that no animal will rid the tank of nuisance algae, there are certain critters that will eat it faster than it grows back, thus eliminating the unsightly algae. (it might still grow in hard to reach areas but those are usually out of sight).