what are the effects of cycling a tank with a fish? i need to get my 125 gal cycled, but im not sure if i can speed up the process. the gravel is the same gravel as when it was drained, not touched or cleaned, and the filters have been cycled before, i have the tank cycling right now, but the fish im going to put in it are to big for there current tank! so i kinda want to get them moved ASAP!!