My catfish and all other fish were fine earlier, i went food shopping and was home about an hour later. Just noticed my catfish was floating around the tank, nose upwards facing the surface of the water, and twitching randomly, every 3-4 minutes like he was in shock? My water parameters are normal, and the catfish has no bruising,nips, cuts, bashes, grazes etc, and all other fish including my clown loaches are fine.. My cat was fine before i left too.. I just dont understand, and has really confused me! What can be said about that, and what can be done to try saving this guys life.. Really dont want to lose him =[