That's awesome! Always cool to see acros in a smaller tank. Never know what will work if you don't trySo far so good - it's been these corals/nems for about a month now. It's primarily anacropora (green, tropicana, and red), a pink Cadillac, and a purple stylo. I've had most for a few years and they've gone through a lot and survived, so they're fairly hardy frags of the (mini) colonies.
Tanks been set up for ~4-5 months. Used live rock (there's tons of smaller rocks that the RFAs are attached to in the sand) from other tanks and new sand. Still got some gha and some cyano that hits the sand here and there
I've always mixed various size rocks in the sand bed as that's more natural to what it would be like in the wild. I'm sure it helps with more anaerobic bacteria as well