i have a 6" sun and when he was small he would hide until lights out but now he's bigger he comes out quite alot,they don't like each other much when they are older i've heard,mine also will take 2" whitebait straight out of my fingers!
I have one. I can't wait until it gets bigger. Its kind of small now. I have seen pics of them full grown size, but I haven't ever seen a full grown one myself.
I just got 3 myself today about 3" they were labeled as "eclipse catfish" I think the more common name for them is "sun catfish" A.K.A "Tai catfish".
From researching I beleive them to be more of a schooling fish. Some sites stated as large as 18" but most were stating the 10-13" range.