04-05-2009, 07:58 AM
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I would like to add to my last post since I didn't answer your question. I can't give you any certain answers cuz I've never had gold fish, but I know they produce a ton of waste, which turns into a NH3 source. You might have to keep watch of your nitrates so they don't get astronomical. Do a small water change to dilute nitrates.
I'm cycling my 5 gallon tank right now and yesterday I measured my nitrates to be 160 ppm, NH3 0 ppm, and nitrite 0.5 ppm. I'm going to use Chemistry topics to explain why I think I am having trouble getting 0 nitrites at 6 weeks into the cycle, so bare with me. I haven't been able to get nitrites to 0 ppm in 12 hours after addition of NH3 and after reading the nitrate test I suspect that the equilibrium between nitrite and nitrate is toward nitrites using Le'Chatelier's Principle as the basis for this conclusion