01-06-2009, 04:41 PM
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You have different size tank than my 37. Your dimensions are perfect for reef set up. Depending on on type of coral, may need MH. If desire Clams and SPS, definitely MH, but with LPS and softies, can achieve good result with T5, PC, and even with flo blbs, provided that you have few on top with proper color temp. 24" in width is perfect. Can build rock formation w/ enough room in the front for fish to play.
As far as RO/DI, it is not cheap, not just to buy, but to run (replacement of membranes, and cartridges and water loss unless you don't pay Water Bill). How often to replace, depends on your water. Water with heavy meneral contents, pretty often. ALthough it is good investment for S/W, can use TapWater Filter by API which goes for about $40 w/ $20 for replace cart. It's an option. May want to do so called Hardness (alkalinity) test (Kits avalable at lfs) before deciding.
Google for RO/DI sytem. It is used for drinking water now days. Even HomeDepot has such products. Check out the installation and how it works brefore purchasing.