How Much Mh For A 75

[matt52]

I have a 75 gallon and was just wondering How many MH light would it take for that size tank to be able to accomodate Any kind of coral Acropia or clams. Would a 175 watt bulb due or would a 400watt be better thanks for any info.

 

[hookedonreefs]

Having a 75 with acros and clams, I can say two 175W bulbs will do. However, if I could do it again I would go with 250 HQIs. Also, I have 2 3' VHO actinics FWIW.
To give you a straight answer, I say 2 250W HQI 10K with 2 actinic VHO supplements. If you have the money and the space, do 2 250 HQI 65K with 4 actinic VHOs.