04-23-2008, 05:08 PM
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In order to be of any help, we'll need more information.
Water params are the first and most important...ammonia, nitrite, nitrate, and pH. We need them all, and we need the numbers, not just "they're fine", which tells us nothing.
How often are you doing water changes? How much water at a time?
What species of puffer?
What other fish/animals in the tank? How many of each?
Foods... how often, what, and how much at a time?
Decorations? How much and what kinds?
How long has this problem been going on? Any other symptoms?
The more you can tell us the faster we can help. If you can post photos, close up of the fish with the problem and a whole tank shot, along with the above info... that would help a lot more.