Cardinal Tetra fin issues

[BenjaminCarp]

I've had a few of my cardinals recently develop what look like bubbles or blisters at the base of fins with a tiny white bit inside. I've been treating with paraguard for a week now. The fish that originally had the issue seems fine but another has now popped up. I'll probably keep with that since the first guy recovered, but I'd still like to know what it is.

Ammonia and nitrites are now 0 and have been for 5 days or so (not the case at the onset). Nitrate is 20-40ppm due to easy green.

It is hard to get a clear picture but you can mostly see it by the anal fin.

[Colu]

It looks like Dermocystidium here some information 

[BenjaminCarp]

Thanks. I've never heard of that before and all my Google work didn't bring it up but that sounds exactly like what I'm dealing with. Thankfully it seems like all of the fish still are active and eating normally so I guess I'll keep fighting the chance of secondary infection and hope this passes.

[Colu]

On 6/9/2024 at 2:44 PM, BenjaminCarp said:

Thanks. I've never heard of that before and all my Google work didn't bring it up but that sounds exactly like what I'm dealing with. Thankfully it seems like all of the fish still are active and eating normally so I guess I'll keep fighting the chance of secondary infection and hope this passes.

Look on aquarium science.org has information on Dermocystidium