The best thing that i would do is If you are the type of person to go away alot then you need to get your self a topp off for the tank then, it will save you the heart ache of having some adding water to you tank.
With lighting you will get heat from MH so if you are going to add one then add a set of fans to the cano[y and be ware that this will cause humidity in the canopy and the fans are going to blow this into your house. If you house is damp it won't really matter, if you haouse is dry it will help it somewhat.
I would go with a 400 w in the middle. a single 400 is better then qx175 IMO,, its going to be up to you for what you are keepingin the tank... if you are going only with softies and you just want a few thing s in the tank. Go for a 175 singel over the tank. Or go with a single 250 HQI, or even if you are getting into SPS and clams and mega flow then do 2x 400w there are a few guys out there runningthem in a corner tank.
Its all going to depend on what you want and what you can afford.. you canopy will need fans and should be high enough to hold the Mh lighting.
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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