derek's 90g build, red deer

[Albertan22]

You'll want to consider what corals you want to put in if you're looking at 39W T5 bulbs. Mind you, if you're looking at a shallower tank it might be ok. Covering that length of a tank you might be better off with some MH pendants. I have an 8 x 59W bulb Tek light over my 120g (24" deep) and it throws a lot of heat. My temperature swings 4 degrees between lights off and lights on, though I do have a canopy over the tank. Cost of replacement bulbs is also a consideration, it costs me a little over $200 to change out my bulbs, which needs to be done at least once per year. Don't get me wrong though, I wouldn't switch my T5s for a MH on my tank, but they're a more attractive option for longer tanks.