personally, I would go w/ the T-5s.

they have a longer spectral life capacity than a T8 (which is Normal output), put out more light, and while you may have to stagger them, a generally a better source of light.

you may not have run into problems w/ the bubbletips under that dim amount of light yet, but you probably will. I doubt your maxima is really happy under that light as well, it's fully open to get as much light as it can.

Normal Output tubes simply can not supply the amount of light needed for a reef tank. planted aquariums? Yes, Reeftank - no.

Get the T-5s.