oj,
i´ve been some issues with macroalgaes, but i think that´s because i didn´t had any herbivores in the tank. so i putted a small y. tang a couple of weeks ago, and they are going away with the predatory behavior of the fish. before the tang police come after me, i must say that i´ll be upgrading my tank soon to a 75g, so the tang will stay in this 29g for a couple of months only. besides that, i think that algae needs a similar lighting source of corals. so, the bulb that´ll make corals grow, will certainly make algae appears, if they have the condition to it (NO3 levels high, PO3 too and so on). i love this bulb and will stay with it no matter what.