They say anywhere from 4-10". I would go for around 10" to keep some room
for air flow under the lights.



"SalahiAndSon" wrote in message
.. .
I just got a Sun Supply Maristar fixture and installed it over my 120g reef
tank. This fixture has 2X250w MH and 2X45w PC. How high should it be above
my tank? I started at about 15" but have raised it to almost 2' above the
water surface at this time. I did this mostly to control the heat issues it
created being lower. I have since ordered a chiller so this wont be as much
of an issue soon but I wondered what the best height to shoot for was?
TIA
G.