11-21-2009, 09:40 AM
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Are the fish gasping all the time, or just after water changes? I always try to match new water temperature, as closely as I can. Slightly warmer water, IMO, is better than adding water that is colder.
If fish are gasping, only after a water change, a change in ph could be causing the problem.
Do you have test strips now? If so, test the tank water and tap water. Post the results of both test.
You say the lfs tested a month ago. A lot can happen in a months time. I have seem ammonia and nitrites go from zero, to unsafe levels in a day. The test strips are better than nothing, but if you can fork out the money for an API liquid test kit, that would be great. The test kit will last a long time, so in the long run, cheaper than the test strips.