From what I've seen, some corals grow/look better under LEDs, others flourish under halides. It kinda depends on what you're keeping. Mike's Stick Farm (SPS tank) has gone crazy since he switched to a combo of halides and t5s. My tank is a very mixed reef, and does fine under LEDs. We have moved a few of my SPS into Mike's tank because it browned out, however. If we weren't moving in a year, I'd add some t5s to supplement my LEDs, because I think a combination approach to lighting works best. At least until they develop a game-changing perfect light bulb for corals.