I've been travelling a lot between mid-May and mid-July, and I'm finally home for the summer and able to focus attention on my fish again. With that, I've also finally had another Amblydoras nauticus spawn two days ago. Was able to video my process yesterday while I recovered the eggs. I hope the video is self-explanatory and helpful. I also added a 4 month update on the oldest 4 fry, which are still doing well but growing oh, so slowly!
As an aside, I'm a bit relieved to find so many bad eggs even at the moment of collection, which means the cloudy eggs may already exist before I harvest them and thus maybe my harvesting method is not solely responsible for eggs turning white. Also, this time I did wait a day to collect the eggs, so that if there were bad eggs at the time of spawning, some of those may disintegrated before I harvested. It's still possible that some of the eggs I observed as bad may have died when I lifted the mop out of the tank, although it's obvious from my video that there are white bad eggs just floating around in the tank, no fault of mine.
I had good hatching last time from that big spawn, but still eventually lost all the fry, I think because the food fell through the floor of the German breeder ring. So this time I will hatch the eggs in the ring, them move the fry to a solid-floor box with a silk fabric cover over the outlet sponge so that fry can't burrow into the sponge and die inside the sponge.
Hopefully I'm successful!
Amblydoras nauticus Collecting eggs through a false floor