The second spawn happened this past weekend. It went the same way- at nightly feeding I spotted the same courtship around the too small cave. The next morning dad was on eggs in the adjacent larger cave. I did not want to leave anything to chance so this time I pulled the cave with dad and eggs to a trap in the tank and repositioned a powerhead to get from flow through it.
Inside two days there was a golden egg outside the cave. This soon grew to a total of about 15 with teeny wigglers. I left them in the trap and used a baster to remove any debris and shells. On Tuesday with one dead wiggler and close to 15 more bouncing around I finally decided to check the cave which I amn unable to se into while its in the trap. Sure enough dad was plastered to the back on some number of remaining eggs and this is when I decided to try and put the wigglers back in with dad in the hopes he would do the work I did not want to.
While it is easy as pie to suck up eggs with wigglers into a baster, having them stay in it while one tried to put the end into a cave mouth is almost impossible, they roll out before you can get the nozzle into the cave. Not one to be stumped too easily I found another solution. A clear flexible hose about 2x the diameter of airline worked great. I was able to suck a few eggs into it, use my tongue to plug the back end and then put the other end into the cave, By raising the back end the water, and the wigglers rolled out into the cave. The neatest part was as i would put 4 or 5 eggs into the cave, dad would back up some to help gather then and move them to the pile at the rear. His tail would poke out of the entrance wiggle and then go back in.
Once I got all the eggs back in I also managed to make the trap tilt so the cave would slope down from front to back. While I am unable to see into the cave to see exactly what is going on, its now been 2 days and not one egg has come back out of the cave.

What makes the common person uncommon is common sense.