comet_nut
Member
I have just done a water change on the tank, about 35%. Clown fish has started clinging to the glass at the top of the tank and appears to be gasping for air, also has a very erratic swimming pattern. Comet grouper has gone from black to grey in a manner of minutes, also appears to be swiming erratically, trying to get out of tank. ie swimming against the glass. Two blue devils ok. Have done standard tests ie nitrate and ammonia and everything is fine. HELP!!!!!!!!!!!!!!!!!!!!!