ha, i was going to say "man are you really going to punch your tank?"
all kidding aside, can you give us more information on the tank you are setting up? So it's 29 gallons, but what kind of lighting do you have for it? I'm guessing no sump for it, correct? What are your goals for the tank.. you said reef so you want corals, but what types (relates to the light question above)? SPS, or softies and easy LPS only?
I'd suggest first get the filtration set up... will you be skimming (using a protein skimmer), or relying on water changes? Either should work for a 29 gallon tank, but skimming wouldn't be a bad idea. Did your setup come with a skimmer? Definitely shoot for 45-60 lbs of liverock in the tank, the liverock will serve as the basis of the filtration for your tank (combined with proper flow via powerheads). Also consider your sandbed depth, either go bare-bottom, less than an inch of sand (less than 0.5 inch better), or 4" or more... don't go in between. 4"+ has nice denitrifying benefits (natural nitrate removal), but I don't know how tall the tank is and if you want to give up 4" of height for sand, your call.
Since you will be keeping a reef tank, it will be critical to monitor and manage the pH, Alkalinity, Calcium, Magnesium, Nitrates and phosphates, for the health and good growth of your corals. You should plan to use RO/DI water for top-offs (replacing evaporated water) and water changes, using tap water is highly discouraged and almost certain to result in hideous algae problems. You can either get a RO/DI unit for your home and make your own, or you can likely buy it from a LFS very cheap (you just have to lug buckets to and from the store).
You should only put a couple/small few small fish in this tank, (a) its relatively small at 29 gallons, and (b) you want a reef tank, so the focus should be on the corals and inverts, as opposed to fish, plus you want to keep the nutrient levels low for the sake of the corals.