ok first you are cycling a tank with fish in it, you dont see the problem with adding fish to the wild "even though u wouldnt do it", your pleco alone will outgrow a 55g, want to feed feeder fish(hello diseases!) to a predatory fish but dont want to pay for the proper accomodations. ithink if you want to take this hobby seriously you should research:read: before you do anything more and realize that it isnt cheap! im not trying to bash you but you ask for our opinions and this is mine. you should check out monsterfishkeepers.com for great info on predatory fish and the proper food for them.:thm: