I am not really a newbie, but this is a newbie question. I am currently cycling my 20 gallon and am using goldfish to do so (comets). I bought three comet goldfish aproxamitly 1" in length. Anyway 2 of my fish have turned sluggish and died in the first week. I am nearing the end of my first week and the biggest gold fish is still swimming seamingly happily around the tank. I have read that if you cycle with too few fish, then when you go to add fish then the tank will go through another cycle. The question is should I buy more fish, this time large, or should I try and use liquid ammona as an ammona source instead of the fish.