Keeping sps w/PC lighting can be challenging. Acroporas in general require more intense light(flow and feeding also will affect coloration).
Montiporas are great corals to start with and will grow under PC lighting depending on the species.
There are quite a few beautiful tanks with a variety of...
You can check Tenecor's website. I know they make 5ft diameter cylinders but ~10ft I'm not sure. The cost of the 5ft cylinders are very expensive ~10K I believe.
You could look at fiberglass 1/2 circle tank w/ viewing panel(10ft wide). Up to 15ft diameter around 2500gal for ~8K.
A recent TOM had similar size 300g+ and was running 2-400W Iwasaki and 2-400W radiums staggered. It was nice blend of coloration and Iwasaki made up for PAR losses of radiums. Radiums are noticably duller next to Iwasakis.
With this setup you only have to replace 2 bulbs and ballasts.
Adam
I have one that initially was small ~3". Only opened at night without polyp extension under 250W MH. I moved it to the bottom of my display with 400WMH and it tripled in size and now has white polyps out all day.
Give it time.
Adam
The controller is to prevent excess CO2 from driving the tank pH down. If set at low end pH 8.0-8.1 it will shut off solenoid on CO2 tank and keep you in a safe range. Years ago I had a faulty regulator without controller that dropped my tank pH to 6.5. The corals and fish don't like that too...
The LOA flood light at HD is 65W(=500W) w/ high output at 6500K.
The hydroponics section on ebay sells Flourex 500W PC fixtures ~$40
supposedly 6500K also.
Adam