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good? that's to be determined. I've heard a lot of bad stuff about odyssea fixtures. And aren't 18w bulbs only 18" A 29g really needs a 30" fixture with 24" bulbs... though if its something you already have you can make it work.
a 2x24w 30" T5HO fixture would be better IMO... Sure, they're only $50 for what you're looking at, but I've heard so many bad things about them, I'd be afraid of wasting $50 only to have to spend a little more for a better quality fixture.
A 4x24W T5HO fixture would work for a high-light tank where you have a good chance of growing a carpet, but you'll need CO2 injection and fertilizers to stave off algae.