Hi, we have a teeny 21l tank and use the filter that came with it. We lost a fish a month ago, he had a white patch on his side the day before. Now one of the white mountain minnows has cotton wool disease, which I've treated with stuff from the pet shop. The filter looks quite gungy; we change the carbon thing fairly often, but my question is, should we also change the metallic sponge part which is gungy as hell? I've Googled but am none the wiser. DH thinks the gunge is good bacteria but it looks horrid. I do clean the tank and do partial water changes regularly. The tank smells a bit at the moment too, which worries me.
Please or to access all these features
Please
or
to access all these features
If you have a fish pond, fish tank or are seeking advice about keeping tropical fish, you can find advice on our Fish forum.
Fishnet
Please create an account
To comment on this thread you need to create a Mumsnet account.