Cory not healing?

I have some Corys and some of them have frayed fins, most notably he big female green Cory, they have like little chunks out. She was pretty beat up when I got her so I don’t know but others seem to not be healing. One of them has a little string of dust or something on its fin, probably because he is the one that always goes to the top for whatever reasons. Over all they are very healthy and active. They are growing in size too, but no healing, very strange

Have you tried daily water changes of 50 - 75% for 10 days?

I would try an immune supplement like Voogle. It’s just vitamins but really gives my fish an extra boost without having to resort to anything harsh. I actually add it to my tank weekly with water changes but it can also be dosed more intensely for acute problems. Not sure where you’re located but I’ve been having to order mine from the UK lately (from Amazon).

How long have you had them? Photos of the fish?
What are the tank water parameters and water changing schedule like?

I'm amazed that I have to keep asking people for pictures. Come on people, if you want us to identify issues with fish, post some clear in focus pictures that are taken under normal white light.

Colin_T said:

I'm amazed that I have to keep asking people for pictures. Come on people, if you want us to identify issues with fish, post some clear in focus pictures that are taken under normal white light.

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It is too fast but here: been for about 1 month, but the healing is slow... I’ll start doing bigger water changes