Hate to be the bearer of bad news, but if thats the only light you have, you need to upgrade before you add ANY corals. That single bulb will not be enough. Could you give us some more info about your light system like: single strip or double. Describe it the best you can. And maybe post some more info about the tank like: parameters, 40g or 125g. I'm about to go to lunch, so I'll check back in an hour or so.