she is a blue platy, and she has a dark blue gravid spot. she stays at the top, and when I put food in the tank she eats just about 5 flakes, she doesnt try to eat the big flakes, and then she goes to the bottom of the tank and hide behind this big decoration, i dont have any plants inside of the tank. He belly is gettin big, and the bottom of it is smooth and looks like half of an oval instead of looking square, i think that she is in the early stage, please help me because she might be stressed and might need to be isolated from the other fish, by the way, i have five other fish, please respond as quick as you can. Thank You ; )