last night i noticed on the left side of my polypterus there was a big black/blue thing under the skin and i thought it must have just ate one of my zebra danios. this morning i look at him and hes laying upside down so i put my hand in the tank and moved him and he flipped over and started swimming around hes very bloated and the black thing is still on him on the inside hes not swimming to good and keeps flipping over does anyone know what this could be?
ive had him for 2 years too