Mmm, do you know about “cycling”, establishing biological filtration in aquariums?
http://wetwebmedia.com/FWSubWebIndex/fwestcycling.htm > He has been in the tank for about two days. He hides most of the time (he has some good spots in which to hide) and only comes out to eat. He seems healthy and eats well. After he eats, he swims around a bit, then goes back into hiding, usually until the next feeding. Is this normal “new” fish behavior? Could he just be lonely?