Sick betta? Silver bulge on side fin

May 1, 2017
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Hi all,

I got my betta (Bubbz) about 4 months ago. He has stopped eating as much as he used to and has developed a silver bulge/lump/blister looking thing on one side fin. I attached a picture and apologize it's not more clear. His color is still good and he is still active, moving all around the tank and creating bubbles at the surface.

He eats this: Amazon.com : Hikari Betta Bio-Gold Baby Pellets - 0.176 oz (2 Pack) : Pet Supplies

And his water is cleaned with this: Amazon.com : API Tap Water Conditioner, 16-Ounce : Aquarium Treatments : Pet Supplies

Any suggestions or help greatly appreciated! Thank you!
 

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