Thanks for all your replies.

I have done a water change and tested the water. The cat that was the first to be 'infected' looks ok - still feeding and swimming around. My other cat - bigger one - has not got any more signs of the spongy stuff.

Can other types of fish catch this virus - e.g. ordinary goldfish and loaches as that is what I have got in the tank. I'm worried that my other catfish already has it so should I take them both out? I happen to be moving next weekend so I have got to do a new set up when I get to my new place so ...

Yes - I have posted another question under another heading - trying to find out what it is. Think it may be viral.

Thanks!

This site is amazing - which I'd found it long before now.

Trying to get a definitive ID of my cats - see attached image.

What is he?

Thanks

Help! I have got 2 catfish and one has developed some strange growths around its mouth - see picture. I have spoken to my local aquarium shop - they just think it's normal growth (!?) and I have also contacted Sera medication who think it is viral and non-treatable. My larger catfish now looks like ...