One thing I forgot to mention SLS fixtures have an opional thing to go with them. A set of legs for the fixture to ajust how high you want the fixture from the tank. You don't have to set it right on top of the tank which you really don't want to do or hang it from the walls. Also good for when you get new corals, and new bulbs. Have you givin any thought to a retro kit? You could save some money. I have done alot of custom canopies/ light racks it is really not to hard to do.