If you haven't purchased the tank yet I would strongly urge you to look into drilled or "reef ready" tanks. They will eliminate the need for purchasing and plumbing an external overflow. I wish that I had gone that route. (but I also had a 75 gal
tank that was sort of laying around.)
AquaC Remora Pro
140#s Live Rock from LiveRocks.com
Frogspawn, Hammer, Zoos, Leather Frag, and Xenia and Green Star Polyp frags from fishfreek and Alarmguy66, Thanks!
Member of the Unofficial A-Team