How much coral?

Thanks for all the info on the the phyto everyone.;D

As to the caulerpa, I have a standard 18" flourescent running at either 5000 or 6500K(forgot which one). I guess I'll try the flood light that was suggested. Hopefully I'll have room. There isn't a lot of space above the fuge, probably 3 inches. If the flood light won't fit I might try a small compact flourescent. Do you guys think this will work?

 

I'm using a 6,500K 13 watt PC bulb in my refugium and have seen growth in my chaetomorpha and caulerpa.