Just a suggestion: I don't know what your settup looks like, but you may want to ditch the glass canopy. Unless you've got a sump under it, you're hindering gass exchanges that occur at the water's surface. Over the long run, the glass is going to get etched from salt spray that's dried up, and light penetration will be seriously hindered; so you'll be using a lot of watts for nothing essentially. Yeah, it means finding a cheap & convenient way to keep it topped off, but it's the way to go.
