I think I might have to stick with my 400s, but not sure until I get teh VHOs up an running. I had my 250 on by itself yesterday, and the side of the tank it was on was just so dark. I am a big fan of the bright tanks.
What I am thinking of now, or just planning out in my head, if I turn the MHs to be parallel with the tank, and run 4 VHOs with them. 2 in front and 2 in the back.
The biggest reason for keeping the 400s, if I go that route, I can't get any bites on them. I have put them on a few forums, and I got people who want to buy the bulbs, but leave the rest of it. If I get rid of the bulbs, I am getting rid of the whole light system.