Ok let see if I understand you correctly you put the stick bugs in your cornís tank? Thatís a big NO NO. Never mix things together and anyway when you have new animals or bugs you should quarantine them for a while to prevent the transmission of diseases and parasites. As for the bug you found, I havenít seen it so itís hard to say what it is. Maybe if you describe it. A clean up is a good thing but donít over react and put a whole gallon of bleach in
as for the nix on juvies Iím not sure so Iíll let somebody else answer.