01-11-2012, 08:01 PM
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A 12 week old tank with no nitrates seems like a serious problem, can you tell us everything you do to this tank, what is added, what is removed, what is cleaned, what type of test kit, do you have live plants, what is the exact name of the water conditioner, how old is it, etc?
As for now the best you can do for your fish is daily 50% water changes until we can get the ammonia to go down. Contrary to what some people say, large water changes will not harm the cycle process.