12-30-2012, 12:00 PM
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Can you post a photo? Someone may recognize the problem (if there is one) if we can see it.
Also, we've no idea what "good" for your water parameters may mean as different people can consider different levels as good or not. Numbers for GH (general hardness) and pH and temperature will help. Then, numbers for nitrates. Ammonia and nitrite won't hurt either.
Also, what foods (aside from snails) are you feeding? How many puffers, and any other fish? How often are water changes done, and how much of the tank is changed? And what additives are going in the water?
Lots of questions, but diagnosing a problem is impossible without the data.