Guppy With Bubble (Cyst?) In Dorsal Fin?

[nosoup4you]

I noticed this morning while I was feeding that one of my males has what appears to be a bubble in the dorsal fin. It is not discolored and appears to cause him no issues. He is otherwise healthy and happy. I am assuming this is a cyst. Is there anything I can do to remedy such a thing and is this preventable?

 

[WILDER]

Does he sit around near the airstone.
Is the bubble on top of the fin or beneath the skin.
Does the bubble move.
Anything inside the bubble.

 

[helterskelter]

Just out of interest where do u get your tank water from?

If you have access to a well then this can cause problems with excess nitrogen

 

[nosoup4you]

There is no airstone in the tank. TBH, there is very little surface movement at all. I get my water from the municipal water supply. It is a heavily planted tank, low-tech, no CO2, but I do use fertilizers regularly. The bubble is in the fin, not the skin, and appears the same color as the rest of the fin. It does not move. If I had to say whether or not there was anything in it, I would say it was air-filled.

 

[WILDER]

You can pop bubbles with a steralised needle. But not sure if you should do that.

Bubbles can be to much aeration, parasites, bacterial, lymthocystis.
Bubbles beneath the skin can be gas bubble desease.