I have a 65 with 2 - 250 Watt MH lamps and 2 - 3 ft. VHO actinic lights. I've never had any problem at all!
Oh yea, and it only has an 18 gallon sump.
I also had a 29 that I go from Josh "ScottFarcuz" that had a 250 watt MH lamp inside a canopy over it.
This would be a 250w MH pendant, no canopy needed.
That being said, I won't plug up this thread anymore! I was simply letting him know that I have a light, because he needs a light!!!!
I am now an assistant professor at Kent State, so I would be able to meet him in Kent too.