take the pups out after they are born. Don't leave them in the tank.
Breeding depends on the male to. His claspers have to form before they will breed. The claspers will get larger and curl up.
When you start to see bit marks toward the back of the female, you know your male is getting the breeding itch.
Just some advice- that works for me.
Find a tank that you can set ontop of your main tank or in your main tank.
Allow water to be pumped in, then drain back out thru a bulk head back into your main tank.
When you do have pups, you can put the pups in this tank. This lets them stay in the main tank water for awhile till they start eating but gives them a safe place away from mom and dad.
After a few week, move the pups to their own tank that has good filtration.
Can feed earthworms or blackworms. (I prefer blackworms but they are not always easy to find in some areas. I order mine in. Cheaper than buying local.
On my main 360 tank, I found a tote that fits rt inside one of the openings. When in place, it sits 5" below the water line. I will have close to the same thing set up for my other rays tank when they start to breed.
I drilled holes in it to allow water to pass thru (also when pups are in it, I direct a powerhead toward it to help the flow of water thru it)
I can easily feed and get to the pups after they are born. Allows the pups a place to settle in for a few weeks after birth and still be in the main tank water.
Feeding is easy and this keeps their food were they can get it and ways from everyone else. This way I can see how much they are eating and no worries about anyone else getting their food.
After a few weeks, I have a 90 gallon tank already set up for the new pups. They then get moved to it to have a larger space to swim and grow.
Pics of how I separate my pups after birth on the 360 tank


90 gallon pup tank for when they are moved
Main 360 tank

