will they eat small platy or molly fry? (i didnt think they would but not 100%.) do they eat bits and bobs of the bottom of the tank becuase i was thinking of getting some for my fry tank so they would help to keep it clean but eating the uneater food as i have no substrate! also i dont know how well they would do in my main tank with amanos? becuase catfish wont eat them and the gold barbs, laties mollies etc wont bother them? do they damage plants? thanks