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He may be correct, that the depth of your tank doesn't require the more powerful bulb, but if you have the means to make the purchase, why not? Your tank will glow with light and promote more growth of the inverts in your tank. Just be sure to get a smaller wattage bulb if that's what you decide.

At what point will the RO/DI unit win the battle with the MHs over algae? Or will it ever?

More than anything, the MHs need to be off of the water line so that there is enough circulation of cool air - once you put these lights on your tank, expect your water temps to go up, up, up.

Any recommendation for filtering the water already in the tank? I am looking to get a RO/DI unit to remove phospates but don't see the value by just adding in cleaner water during the monthly changes - that'll take a lifetime to see the difference with 190gal! I am having a green algae bloom...

So what was the outcome with your MH's? My Oceanic 175gal bow-front is giving me similar concerns now that I am deciding to upgrade the lighting. I was just considering adding-on the optional legs to prop it off of the glass top and plastic support - however, I have 3 lids and 2 supprts...