Even tho there are babies everywhere in various stages of life I removed what I could and searched for him.
He was my teenage BN male. Not any of the just borns or prior borns, a medium sized adult, smallish still. He loved to dig and I always feared he would dig somewhere and something would collapse on him. I was always moving rocks and trying to get them flat cause he would dig under everything.
I found him dead under a cave. Here is apicture of him digging as he always did. He is to the right of the cave digging under,

He was my favourite BN, always up to mischief and digging. And it was the end of him.

Will teach me to go with my gut instinct more, I should have broken it down 2 or 3 days ago, maybe I could have saved him. But I was afraid to injure babies that are all over that tank. Those babies are smart tho, I never get them, I should have searched for him and not assumed he was just somewhere. I gave the tank a 50% water change and cleaned it well while I had most stuff out. I will do another 50% tomorrow.

How can I make sure it nevers happens again? I have driftwood, rocks , slate, caves... plants ....