Corals to Cover Bare Bottom

[Jaws]

I wanted to go with a sand bottom in my new tank but it looks like there's going to be too much flow for sand so I'm considering a couple other options. One option is to go bare bottom and the other is to go with crushed coral or something similar. My question is, if I were to go bare bottom, what corals could I place on the glass that would encrust, or multiply? I like zoos but they can get out of control in good tank conditions so I'm thinking corals like ricordea, acans, favia, etc. Does anyone know how these would fare on a bare bottom tank? Any other suggestions? Thanks for your help.