View Full Version : Fish Has Bubble in Dorsal Fin

10/05/2017, 01:35 PM
Hey all I have a lawnmower blenny in my 90 gallon tank that seems to have developed what I can only describe as a tumor. He has been in there just shy of a year. I've attached a couple of poor quality pictures of him. Any idea on what this could be besides what I think it is? No livestock changes in the past 2 or 3 months and he is eating fine without it obviously effecting his swimming ability.

SG: 1.025
Amm: 0
Nitrite: 0
Nitrate 1
Alk:7.6 dkh
Mg: 1440