I have a 20L frag tank and it has a 30" Sundial T5HO fixture on it. This one comes with built-in timers, 1 for each set of bulbs. There are 4x24w bulbs and individually contoured reflectors (practically like individual reflectors), and moonlights. I have 3 tiers of egg crate to put just about anything in it; currently I have 2 colonies of different types of zoanthids (growing these out), 2 types of mushrooms, some monti-cap frags and one big monti-cap, monti-digita, green bali slimer, branching porities, neon green candy canes (started in the frag tank as a single head frag and it's already split one new head and is working on another), and a small bird's nest. All these frags/colonies are doing great. I think this fixture is a great way to manage any kind of coral and it's a great price.... I paid $200 for mine.
So is your tank a 20L or a standard 20?