The head of one of my fish and under its gills have become very red suddenly
Does anyone know what the problem could be?
None of my other two fish and two loaches have any problems.
I cleared the filter two weeks ago and the water is in a good condition. I feed them pellets (although have recently started giving them flakes).
This is quite worrying
Does anyone know what the problem could be?
None of my other two fish and two loaches have any problems.
I cleared the filter two weeks ago and the water is in a good condition. I feed them pellets (although have recently started giving them flakes).
This is quite worrying

