This is how I did it.
Pull the stack out slowly releasing the water, so as not to suck the fish through, but one of the young bangaii go anyways.
Good thing the bucket was under the drain pipe.
The pull all the rock out, thats in there because its a refugium also. Next try getting your arm in the 7in. sq. 30, {&^$$*&(*((P*&,} inches deep overflow, with a net and still see what your doing.
Then be surprised that the single remaining juvy bangaii your trying to catch, has three more babies for company.
Then chase them around with a brine shrimp net, on the bottom, that you cant see, scratching the crap out of your arm on the growth on the overflow walls.
After about half an hour, kick some stuff around in the fishroom, go for a walk and start over.