vented all of them last night - turned out one of the "females" and the smaller one were both males! So I actually have a dominant breeding pair, and a subdominant reverse trio.
Thanks. Got about a hundred wigglers out last night. Saw more in the morning but decided to leave them in the tank - see what happens.
These guys are not the best parents. Quite a few wigglers were scattered around and just wriggling on the sand substrate, but the parents didn't seem to be paying much attention...still guarding the eggs.