[Hi im wondering what type of MH I SHOULD get for my tank, like what wattage and type? My tank is a 55 gal 36x21x16 i think if not its 36x16x21 ...... Well thanks for the help!
What are your plans for livestock? said:Yeah, what Brad said.
For soft corals, you would go with lower wattage, like a couple of 175w fixtures or even VHO or PC. For SPS, it's a little more difficult. I used to like the 5w/gallon measure, but in your case it doesn't work. 275watts isn't enough for SPS IMO for a 36" long tank. Even a 400W lights about two foot width x 2 foot depth. You don't need a 400 because you don't need that much depth.
I can't give you an opinion on whether 250's or 175's are gonna give you enough intensity for SPS. I only use 400's for other reasons (space related). But two 250's might do ya.]
Just my inexperienced opinion, but if I were doing clams, I would do the 250's anyway. You might be ok with maxima's or deresa's, but I would be very hesitant to say that you could ever keep a really nice crocea alive under 150w. For the small price difference, might as well make sure you have the intensity to keep whatever you're gonna want to keep.]