To increase your odds feed frozen foods like bloodworms and brine shrimp. And most importantly, from my experience, get any and all males outta the aquarium to decrease stress. My females will have 1 fry per month for 3-4 months after theyre prego and I remove the male. I also don't use breeding nets... Just live plants for hiding spaces. My females are far less successful in breeding if/when I keep the male around to harass them.