[SaltWaterN00b]

I have a newly setup 35g hexagon tank and about to get a 250w single bulb MH fixture, how far above the tank to I hang it? Ive been hearing mixed heights so im not really sure.

	MH Metal Halide Lighting, typically used for high intensity light demanding corals such as SPS. Bulbs come in varieties of spectrums (7k, 10k,20k), and intensity (175W, 250W, 400W).

[duke62]

i hung mine 10 in from top of tank and it worked fine for me

[Awibrandy]

Mine is at 12" from the surface of the water, and my tank is 24" deep.
The reason you get many different answers is because not all tanks have the same height or inhabitants.
Hope this helps a little..

[NYreefNoob]

mine is 6" also depends on how high the corals are and heat isnt a concern for me since i have a chiller

[Bob 1000]

How deep is the tank?? I think you can go about 16".. To keep heat issues away..

[SaltWaterN00b]

tank is 24" deep

[tocan]

Its all about the heat and the depth of your tank.

[bushh23]

Also has to do with what youre keeping and where you want to keep them. I've found that softies, lps & ricordias like it closer to the bottom so as not to have too much light strength on them I keep my lights 6" off the surface and my tank is a 75 gallon.

	LPS Large Polyped Stony corals – In the aquarium hobby this is a common division of the species of stony corals based upon the visual assessment of the size of the polyps. Corals in this category were among the first stony corals to be kept successfully in captivity and include many very beautiful species. Commonly kept Genera include Euphyllia (hammer/frogspawn coral), Favia (brain coral), Plerogyra (bubble coral), Lobophyllia (meat/tooth coral), and Caulastrea (candycane coral). LPS corals also include the popular solitary non-colonial stony corals such as Fungia (plate coral), Cynarina (button coral), Trachyphyllia (open brain coral), and Herpolitha (tongue coral). Like their SPS counterparts, LPS corals require good water quality, intense lighting of the appropriate spectrum, adequate water movement and regular supplementation of calcium.

[ClosetFishGeek]

There are so many factors concerning this becouse there are a lot of variables. The basics for this is the depth of your tank, but more importantly what are you housing in your tank. Sps, softies combo ? this makesa tremendous difference. In addtition, the reflector, bulb, and ballast combo are most definitely not created equall. I used to run a luminarc reflector which i would hang 10" from bulb to water and get the par measurements i wanted..now i am running a lumen bright reflector, coral vue ballast and reeflux bulb and i have to hang them 16" from water to bulb and getting the same if not better in many instances par readings.

	SPS Small Polyped Scleractinians - Sometimes known as Small Polyped Stony corals. These are hard corals that have extremely small polyps. They are typically on the difficult side and require Metal Halide lighting or dense Power Compact or T5 arrays. These corals are prized for their rareness and ability to be easily fragged into multiple colonies.