i have a 100gallon tank but how does the tank benifit from them. my biggest one is 10" and the others 5". so what is the other fish benifiting from while there in there? ive seen tanks with out pelcos in there and they are clean. but mine sit around and do nothing? they swim around just like the other fish hmm idk i thin there pointless. and sugestions?

By the way you ever seen an adult L-25? Color is fascinating and full of personality.