Join Date: Jul 2010
Location: Outside Philadelphia, PA
I can see you already got something, so this post may be moot.
I run two 150w MHs on my 90 gal tank. As of now, I don't use CO2 on it, and only do fertilizing about one a month. I don't have an algae problem either, even with the photo period about 8 hours a day. I still have to remove a bucket of plant growth from time to time. So it can be done.
MH's do get hot, and this is part of the down side, but because they use a different method to produce light, they really are not a lot less energy efficient than T5's, VHO's or other fluorescents set up to give the same amount of light.
I can't help but wonder if any of the others here that are critical of MH lighting ever actually used it.
I'm trying to say that it's the ideal light for everyone. For many, it's not.