If your tank is braced every 24" then definitely go with the MH (although 3x400w may be overkill, 3x250 would probably do). I just picked up a 125 (72x18x20) and was contemplating the same thing as you as far as lighting it goes. As I bought it through an online ad for an estate sale, I didn't actually see the tank until I picked it up this afternoon.
Long story short, I was anticipating a standard AGA tank with 24" spacing between the braces...wrong, only a single center brace with some additional glass bracing on either side of it. So the MH pendants wouldn't have worked as the center pendant would have been over the brace casting a nice big shadow down the center of the tank. I opted for 4 96w PC fixtures instead. |