what i do is simple : the "foot" of the mush is glued to a rock..i use a shapr exacto or cutter, and just slice a tiny bit of the edge of the foot...like 2 mm max. I turn the rock so the new chunk will be able to get some light. That's it
Eventually, even kinda covered by his "mom" fully opened, he'll grow. First it will be translucent, then will become thicker, then the "crown" will form..after that the baby will try to reach more light, growing toward light and possibly moving.
You could use the exacto and slice under the chunk, scraping the rock.
Anyways that's what i do, and it works.
I wish i could do like mush and cut my pinky toe, then a new me would grow and go to my job while i spend playing with my tank