Blistering Fish?

Question
I have a Black Moor.  I think he has some issues... His dorsal fin seems to have some sort of white blister looking disease and he seems to be having a hard time swimming down.  He floats a lot on the top of the tank...sometimes I think he is dead.  Then he swims to the bottom and float back to the top.  Now he doesn't even use his dorsal fin to swim.  

I don't really know what his/her problem is, maybe some advice would be nice.

Answer
Hi Sara,
The white spot may be an injury that will eventually heal on its own. I don't think he needs any medication at this point at least. I've observed many fish develop little white bumps on their fins that is often a situation where an individual fin ray has been bent or otherwise damaged. Just keep a close eye on it and make sure your Black Moor has very clean water through frequent partial water changes and is getting a varied, balanced diet.

But otherwise, your Black Moor's swimming issue is whats called "Swim bladder disorder" a very common condition in fancy goldfish breeds.

Please read here for more info and advice on this!

http://thegab.org/Illness-and-Treatment/buoyancy.html

I do hope this helps and best of luck!!!
Karen~