I don't think its columnaris because no white saddle has appeared.
He hasn't got any worse but the poor little guy is still very weak. I've noticed he has a few red patches in his tail and the edges have frayed a little. I'm not sure whether its fin rot or he's torn it on something as he has been dragging his tail a lot. I've put AQ salt in, which doesn't seem to have done any good.
I really want to start treating him, but I can't because don't know what for...
Anyone have any ideas? Someone suggested its a vitamin deficiency, do you think this is possible? I feed them on complete tropical fish flakes, would pellets be better?