Nice!
Only thing i can think of for flow and keep the tank clean of equipment is do the powerhead in the false wall and/or loop the SCWD returns around the top of the tank and pushing water back towards the false wall. Not much room in the back for equipment though.
From the look of the Acan on the 40 thread it looks like its going to stay close to that color scheme, but possibly color up more. The light peachish color with deeper orange mouths. I guess we'll have to wait and see.
Looks to be an Acanthastrea Echinata. I assume you are just fragging the mother and putting a frag in this 10gal?