CBB is reef safe. I have Magnifica, Gigantia, Haddoni, Malu, and Tapetum in my reef with my CBB. I also have several LPS Goiopora, Alveopora, Elegance, Frogspawn, Fungii without problem. No problem with SPS either. Over the last 30 years I keep about 5 CBB. Never problem.
All your Aptasia, feather duster, medusa worms will be eaten. A lot of the visible larger invertebrates in the rock and sand fauna will be gone so the diversity of your sand and rock fauna will be less