I have a male lyretail guppy with 3 red tailed female guppies. theyve been in the same tank for about 2 weeks and one seems to be pregnant. she has a dark gravid spot and her stomach is growing big but her gravid spot seems to disappear sometimes. Is that normal? One of my other female guppies has a stomach that is growing but no gravid spot appears at all. my last guppy just seems to not make much contact with the male guppy. please reply i need advice quick.