I got him/her 4 days ago and it hasn't ate yet!!! He/she's only 4 or 4 1/2 " right now. I've been puting cut up shrimp in the tank along with some guppies and still nothing! Any ideas on would it eat. Please help.

I know what kind of catfish I have, but that's about it. Can anyone give me more info on these fish...like foods to feed, growth rates, sexing...stuff like that. thanks