i bought 2 baby oscars they are about 1-2 inches each. i have them in a 15g right now waiting for them to get bigger to go into a 60g tank. at the store they were really active swimming around and everything. but when i got them into the new tank they hide behind the rocks and dont come out. ive never had any of my fish do that. should this cease soon or is something wrong. this is the 2nd day ive had them.