TropTrea
New member
Grim need info on which t5 fixture to buy. will be mixed reef 36 x 20 x 20.
ati 6 x 24, 4 x 36, 6 x 36
i have been told ati 6 x 24 is enough
You would get fall out on the ends if the Lent of the fixture does not match the length of the tank. Even with a perfect match there actually is some fall out but not nearly as noticeable as with a 6" gap on each end of the tank. So basically rule out the 24" fixture.
The six bulb fixture will defiantly give your roughly 50% more par than the same brand and design of a 4 bulb fixture. Personally Id even go with a slightly lower quality fixture and have more bulbs to give me some extra ability to tune the fixture to my eye.
Another big factor is what kind of corals that you keeping. Most SPS like a lot more light than many soft corals. But the 6-36 from your list should be the best bet all the way around.