Alright, so when I first started my 15 gallon aquarium it had about 30 or so baby guppies in a breeding net, and about 10 platies (4 pregnant) and 10 guppies (2 pregnant) and two baby crayfish. I had seen a couple of my guppies die and I believe it was the crayfish because I saw it grabbing it and killing it, so I gave my two crayfish away. And I got a Albino corydous, but still after that, one guppy died, i mean the platy are doing fine, why do you think this happended?
Also another question, I have 3 or 4 fat as cab get platys (pregnant) And I'm sure they are, but they've been that way for a week by now, how come they havn't given birth yet?