Unfortunately my catfish died 10th May.It's colouring had faided as if it's body was breaking down.The swelling had got bigger.

4 Guppies,4 Swordtails,3 Cardinals,4 Rummie nose tetras,4 Bronze catfish,2 Clown loaches

Tank is 26 centigrade and I have a Fluval 4 filter.I will do the tests on water as soon as I can.

I feed live food once a week blood worm and daphnia.part water change every 7-14 days

The tank is 4'x18"x12" the rest of the fish are community fish swordtails,guppies,cardinals,cloown loaches and bronze catfish,There are no signs of any injuries.

I have a Featherfin catfish which is approximately 6" and about 13 years old.He/She has a swollen area on the underside just behind the pectoral fins inche and a half long and about half an inche deep.Could anyone advise me on what this could be.Sorry if I have posted in wrong place .