Agree with Ace, 2.5 watts per gallon may be a little weak in the light dept. May want to bump that up a little (not much).

What about iodine? I had softies for years and had lots of luck with lugol's solution.

A few times a week, I'd also add a couple of teaspoons of blended frozen fish food at night to feed the corals.

Stable alkalinity (7+dkh) and ph (8.3-8.4) also helped a lot. Be sure to check your readings at night and day to see how much of a swing there is on these levels. You'll want to minimize those swings as much a possible.