and tubing for both.. and a good diffuser
I have the freshwater version of the light which does not have the actinic light in it, it has two, 34" 96 watt 6,700°K bulbs in it. That is why I am thinking CO2 now.If you have that light w/ an actinic bulb, you essentially have half a light. Replace the actinic w/ a whiter bulb in the 6500K-10,000K range and your plants will perk right up.
links to a couple of my posts etc. that spell out some CO2 stuff:
Drop checkers
KH standards & other drop checker related stuff
DIY mix