I have a new 30 gallon tank about a week old. I have 2 dwarf gouramis, 2 blue powder gouramis, 2 angelfish, 2 black mollies, 1 dalmation mollie, and 4 dori. One of my dwarf gourmi is kind of chunky in the belly and stays at the bottom of the tank alot. Is it sick or pregnant. It comes up to eat during regular feedings. Also what fish do you reccomend having in the same tank. I have another 20 gal tank that i am setting up in case there are problems. I already had to remove a dalmation mollie for nipping.