This is the UV I have myself (and had success controlling ich with):
http://www.customaquatic.com/estore/...ct=UV-AUA00067
Your tank is bigger than the one I ran this on myself so you might want to look at a higher wattage (although the manufacturers website seems to suggest it can be used as a sterilizer on SW tanks up to 350gal. More info here -
http://www.aquaultraviolet.com/produ...classic/57watt ). Bigger ones seem to double up on the lamps so 80w is really 2 40w units, 114 is really 2 57w units and so on.