greetings;
it has come to my attention that you have two threads about the exact same issue. though i have already anwsered your other one, i'll take time to anwser shortly to this one aswell.
it is important that you make sure your aquarium temperature is suitable for the catfish, when i aquired three catfish, they didn't eat the food that they were given for up towards the first week, instead, they feeded off the plants [live, ofcourse] and the tree stump. after that, they always eat the specialized catfish food when it's given to them. if the issue is that the catfish does not eat the food given to them, i can only recommend feeding multipical times a day, untill the catfish investigates and finds out that it is edible.
sincerely;
nrk.