females with eggs will get pretty big bellies, I don't see any reason for concern with those unless you notice some odd behavior. You should be okay with the 52 gallon but make sure there are PLENTY of hiding spots around the tank. With the male in there he will most likely chase the females quite a bit and so your females will always be in a heightened level of stress. This opens them up to potential diseases so make sure you constantly monitor them. Also note that females can be aggressive too and can attack males if they are not ready to mate and are getting hassled. Sometimes a fish will defend itself by being aggressive. So, keep an eye on the male as well. Otherwise, everyone seems that they should be fine in there, just keep a close eye out.