OK this is round two! Last night they went at it for a few hours and I didn't even turn their tank light off, no distractions. This time they have been in a 20 gallon tank by themselves. This morning I added some methylene blue over the eggs (that did not make them happy) and blocked the light a little so it's not so bright all day. Keep your fingers crossed. Not a great photo but a screen shot of my Blink Mini surveillance camera viewed from my phone I did not want to be intrusive with a camera and my face in front of the tank.
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It's funny how I gave them 3 flat rocks and they chose the same one from the first time.