Use artificial hatching. Take the parents out and put the driftwood slanting. Then put airstone below the driftwood. After hatching, they'll need the parent's slime to survive.
From here, i dun know liao but i think you can put the parents back
Re: Drift wood plan
Wood with eggs
--------->I--I Eggs
I I <---------------
Airstone I--I
-------------->O
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