hi there, is there any one out there that can help us? we have a 800l tank with african cichlids, and all of a sudden we have had alot of deaths in the tank. the fish generally lose balance and co-ordination and start to swim in rather spaz circles. i tested ph, amonia, nitrite and general hardiness, all in normal parameters, we havent changed anything in the tank and it has been humming away quite nicely. almost thinking a swim bladder disease??? thanks!