It sounds very cool, But in reality it sucks. Galaxia is one of the hardest stinging corals, with long sweepers. I have one the size of a Cantalope. They like to reachout and touch everything within 6 to 10 inches if it.
Zoo's and Palys are safe under it on a rock. The sweepers won't reach down to often.
Try Blowing a powerhead in the direction of your overflow that might get most of them out of you DT.
Congrats. on having your tank setup so good that Coral is spawning. Just hope the CUC and the fish can eat that many eggs before they take over.
The only thing in the tank that like the sweepers is my clowns. They think they are to play in. Good luck
keep us posted.
