Those of you who rebuking this person for looking for poop eating fish should shut up. Although to my knowledge there aren't any poop eating aquarium critters, there is no problem with trying to be more efficient. I have heard if you have trouble with poo try shrimp snails and plants out in your tank. I have heard this addition to any tank can really help with moving the poop around so the plants can use it up. But if you have cichlids, this is probably not for you, as cichlids will eats the shrimp and snails and tear the plants.