yeah i wouldnt add anything to my tank until i knew it was safe, but thats why i was wondering if there was a website or something that had catalog of them because i dont know what freshwater amphipods/isopods look like (i know what most insect larvae look like and wouldnt be to worried about that anyways as if one accidently made it into tank im sure the cichlids would take care of it pretty quickly) but yeah maybe ill just stick with snails for now just thought it would be cool to have really diverse cleanup crew like they do with saltwater but maybe its just not a very viable option for freshwater...