Yeah its tricky they seem to give birth while I'm at work then I notice they are no longer pregnant and there are no fry in the tank either. Crazy canniballistic guppies. For some reason it only seems to happen in my smaller tank, the bigger tank the fry survive well.
Now that silver dollar name rings a bell, the cichlids are quite diverse in their shapes and coloring. My favorites are the red devils.
More space does seem to reduce the cannibalistic instincts in fish
I guess I also have dragon guppies in the other tank, I wonder if they are more aggressive.