Ive had my flame angel for about 1 1/2 yrs now (my tank is a well established 4yr old tank). Recently, my angel has been acting differently, swimming with its head pointing upwards and finning with jerky movements as if it was trying not to sink to the bottom (not at all like the smooth way it usually glides through the water.) It does not seem to be breathing hard at all, and it still eats very well and otherwise seems to be ok. There are no spots of any kind on the fins or body and the fins themselves seem to be in good shape and intact.
My nitrates, nitrites, phosphates, PH
, alkalinity, temp, salinity, calcium and ammonia are all normal. I havent added any new critters to the tank and I run a DSB
with live rock and a protein skimmer.
Can anyone tell me why the sudden change in behavior? It seems like its struggling to stay afloat but otherwise looks ok and eats well. Is there some sort of swim bladder sickness that i should know about? If thats the case, wouldnt it be turning on its side as well?