My 10 inch moray eel is in a 75 gal. tank with a 5 inch grouper. The moray barely comes out from behind it's rocks and is not eating. Is this normal eel behavior? I don't necessarily think the grouper is harassing it, in fact I see the grouper going up close to the eel almost like they are friends. At feeding though the grouper will take all the food unless I keep it at bay with some tongs. Today, still the eel would not take the silverside which was cut into small pieces.