Yes, i wouldnt feed him for a bit, i had guppys get that big, then "explode" and die. My issue was i fed mine freeze dried blood worms and it stopped him up, the peas didnt even help. As for the mollies, give it a week or two and post another pic of them. I have Platies atm, 1 is pregnant and she is GI-FREAKIN-NORMOUS! She was prego when i got her but i didnt know it, brought her home and a few days later you could tell. She is with another female and a male. I have never put my mommys in a breeder trap because i didnt want the fry to live, exspecially not if i didnt have room, some still lived on there own hiding in my plants. Best of luck to you. Let us know if you got any other questions.