I have a black collared catfish (came with a tank I bought) but I am having trouble feeding him. I only see him in the very early hours of the morning (7am ish) and have tried adding food to the tank them but it shows no interest? I sat up last night till nearly 2am waiting for it to emerge so I could try feeding him but once my eyes started to close I gave up and just added some bloodworm pellets and hoped he would feed. I have tried prawn, different catfish pellet, bloodworm pellet but nothing seems to tempt him to eat. When I do see him he does have a good shape so he is not loosing weight, just worried I am not taking propper care of him.