I'll add my .2 cents.. it's an artc. They hate the light for one, I noticed you mentioned it's on 24/7. I would highly advise against this, its uncomfortable for the fish, and doesn't simulate real time. As mentioned they can go a while without eating, along with Viktor I wouldn't worry until it hits a month. A fish at that size, looks around 4", isn't going months without eating however, I disagree there. But the fish can very well be settling in still. And if somethings messing with it, as mentioned, it will prolong that period. If it's coming out but hides when you see it, its because it sees you and is scared. Id advise starting off by throwing food in with the lights off and only peeking in the room or standing on the opposite side to see if it's eating. Far as max size, in aquaria don't think we have a member who reported one larger than a foot, they're rarely kept long due to their aggressive nature. In the wild however they have been caught up to a little over 4'. 52" according to fishbase. Of course that's likely an old fish.
Thank you for the input. I keep the lights off at almost all times now. I will say the lights are pretty well dimmed but i did take them off anyway due to advice i recieved. The fish almost never moves, ive seen it a few times move when i am laying in bed at night and than it just goes back to its original spot even without me taking a step out of bed (my beds accross the room). I have mentioned the convict bothered it at first but the convict seems to be scared as hell of this catfish it does hast gone near it since the day after i got the catfish so i wouldnt think its that. I will send a picture of the lights just so you guys can get an idea & of the spot he sits in 24/7. Also will put up the water paremeters later in the day as mentioned when i get the time to do so.