Hi I have had my tank up and running now for 5 weeks. I have two swordtails (1 female 1 male) 6 plattys ( 5 female 1 male) 7 zebra danios and 2 corries. Two of my plattys seem rather big and I'm wondering if they are pregnant? How long before they drop? And would you recommend breeding tanks? Or allow the fry to be eaten?