I'd go for T8's - 30% more lumen output I believe.

Sort of. More like the same light for less watts. Almost the same anyway,
depends on the tube.

I'm still coming to grips with the idea of an 850 gal tank. I think I'd
use sunlight or a 1000W MH bulb on a light mover. Or both.

To grow Cabomba?!?

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