They need a cave with a small entrance, like a 1/2 coconut shell with a notch in the rim.Will they breed in this?
Just following up on this but that's exactly what happened I didn't see exactly where but I did see fry shortly after introductionMost females prefer that their breeding caves' openings just large enough so that they can slide in sideways. Your cave probably won't be used. Most likely your female will dig a cave under driftwood.