That may be a bit much for a 20 gallon. Most likely you will burn, bleach, and at least wash out anything you put in there. I personally wouldn't go with that much overkill, especially since it doesn't sound like it will be exclusively high light Acros.
it would be better to just put anything you want in the display directly into the display. The only exceptions I can think of are small corals being susceptible to fish that like them too much, like clown gobies sitting a small acro frag or a clownfish hosting in a small LPS
colony. In those situations it would be good to grow them out a bit before adding them to the display.