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I'm new to this forum but had to join to ask about my Cory cat's weird fin, which we only noticed yesterday. As we have a large tank (180L) and the cories are quite shy, it may be that he has always had this condition and we've only just noticed, or it may be a recent development.
Either way, I thought it would be good to seek your opinion on what could be the cause of this lumpy fin.
As you can see from the picture, one of my Cory's fins almost looks like a fishy version of a club foot. From a distance it looks fuzzy, as if it's a fungal infection, but on closer inspection it looks more solid, as if the fin is encrusted in something hard.
The fish's behaviour is completely normal, and he's no more shy or skittish than the 5 other cories we have. He seems to be waving the fin around and using it in the same way as his other one.
So what could be causing this growth? Is it a deformity we just haven't noticed before, or something we should worry about?
Helpfully the fish in the background has posed to show us exactly how the fin should look, so hope that comes in handy too.
Hope you can help!
Thanks in advance.