i have 3 tanks, one is already cyled, so are all the others. ive done this before, i have done a fish cycle w/a goldfish before, and its still alive 1 yr. later, and ive had the fish for 3 months now, y would i return them??? . the fish are in one of my old tanks, the good one now, so im not returning them because the water in 1 tank is good and im still setting up the new 1. the tank that has high amonia was cycling for 2 months now, i used amo lock because someone said it was good, but it does give u false readings, so it minght be low. and if the 1.5 weeks one isnt good, ill keep them in the other 1, it has a goldfish in it though.