I have mentioned this in another thread (slime on heater) but thought i might get more help here.
I have a young bristlenose and he has developed a blister/bubble protruding out from underneath his pectoral fin.
It just looks like an air filled bubble , maybe it has clear fluid inside, I'm not sure. Under the bubble where his skin is, it is pale white. He's hard to get a good look at but there might be another smaller one under his other fin. The big one certainly looks uncomfortable and I think he has stopped eating.
I have put him into a hospital tank and am treating with furan 2.. today is day 4 and still no improvement.
Not sure what I should do for him next .. I'm almost tempted to pop the bubble with a sterilised needle and leave him in the furan-2 an extra day.
Any ideas? From everything I've read, the most likely cause seemed to be bacterial but the furan isn't helping. He doesn't move around much.