Powder coating *can* be done at home, but in all likely hood, it would be cheaper to have it done. (sprayer, coating, UV heat light, etc).
It basically involves spraying a plastic based powder on the metal that is electrically charged, then baking it on.
in SO CAL, I would suspect there are a half dozen or more places that will do it for you and they can do any color you can imagine, and more. Just check the yellow pages. The stuff is near indestructable. I would be suprised if a stand for a 180 gallon tank (I'm assuming that is the tank in question) would cost you more than $50.
Addmittedly most of my experience is with freshwater, but with on exception all of my stands are home made and steel, and all I have used is rustolium 'industrial' that comes in a quart or gallon from home depot. the stand on my 180 gallon Oscar tank (its been alot of things) is still nice after almost 10 years.
As a side note, I also used it to paint my off road 4x4, and 3 years with minor touch ups, it still looks great (minor touch ups involve hitting trees and rolling in to rocks)
