Finnaly got a new tank for Freddy Jason and Manson!! Now i got an empty 35g tank that i want to put fishies in. I was thinking getting 6 pea puffers cause I could keep them in that for life right? I'm currently cycling my 4' 55g and getting it ready for my piranhas, but after they are moved would I need to compleatly empty the 35g and re-cycle the tank? Or could i just take out and clean the gravel and everything in the tank do a water change and put the new fish in that without having to cycle it?