My daughter has her own 10 gallon tank with 1 male guppy, 1 female guppy and about 20 babies. We had two females but the older one just died (I assume of old age or possible after this last batch of fry). The male guppy has slowly been getting fatter and fatter, his stomach looks like a pregnant female. Tonight when I went in there to feed them he looks like he is going to pop, he is still eating and acting normal, has anyone ever seen anything like this?