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Thank youVery interesting catfish.
Indeed, just like thebiggerthebetter said, it is food. There's a shop here have the best quality feeder fish. I did stop feeding him feeders but this is the first time for the past few months I gave him, as a treat. Usually I only bought Chinese Shiners but bought the goldfish to act as tank cleaners. Food & clean, win win.Like the fish, not a fan of his tank mates.