I tried working with an Eclipse III hood on a 29g for a long time and unfortunately it never really supported plant growth very well...it worked, but growth was stunted and slow. I was also restricted to a few, low-light species. The retrofit lighting kits are NOT safe to install (fire hazard, per Marineland (most retailers won't even sell you a retrofit kit if they know it's for an Eclipse)...canopy is cheap plastic, not ventilated, and is built to be used without a reflector), the stock lighting is no good (2x18w T8), the filtration causes too much surface agitation, and the filter pads are expensive and a joke.
Don't get me wrong, the Eclipse hoods are great for a regular 'fish tank', they're just way out of their league when it comes to effectively supporting a planted tank.
That being said, if you really want to grow plants and are married to the Eclipse III hood, check out http://saltaquarium.about.com/gi/dyn...reflector.html
, put in two good quality 24" 'plant-gro' bulbs, replace the 29g with a 20 long, and start from there. That way you'll at least have 2wpg of 'good' light that's actually being directed downward toward the plants.
Good luck, don't get frustrated, and have fun.