I believe my oscar is constipated. I noticed 2 days ago that poop is trying to come out and he has a bulge in his stomach. His behavior on the other hand is unchanged, he still begs for food and gets all excited when anyone walks in the room. I decided not to feed him last night to see if he got it out by this morning but he hasn't.. should I continue not to feed until he passes it? I don't want to add to the blockage. Any ideas?