well it's definatly a fungus. this morning it was all fluffy on my parrot chiclids and a few others. so i treated the tank with a fungus treatment i had. one of the parrots died. . but the rest have got alot better really quickly? alot of the fungus has gone down and some gone completly. only 1 fish still looks a bit iffy and thats a paradise fish thats getting old now and hasd lived through alot. but hopefully its going to stop soon!