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What size tank? Normally, just get them in a 1:2 male:female ratio and as long as your tank isn't tiny and your water quality isn't awful, they should breed like crazy.
for me platies and mollies is the easiest fish to breed, i just put them to their tank, and wait till new fry comes..
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I think your tank need lot of hiding place and lots of plants like cabomba, that work for me..