This morning my green spotted puffer fish is lying on the bottom of the tank. It seems as if he can't float. Not interested in food. He looks very 'solid'. He moves around but very slowly and not like normal. Had him for just over 2 months. Not in brackish water yet as was told to leave for a bit in tropical water. Nitrite levels etc all fine. Should I start switching to brackish water? Can anyone help please?
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