I have approx 2.36 WPG with my Coralife fixture. No Co2 (yet!), very mild dosing of ferts, and no major issues except diatoms, I just put two Otos in to help clean that up a bit. I don't know about retrofitting it, I just put mine over the glass versa-top for now. It's not an unattractive fixture, just wish it were in black so it blended a bit better with the tank/stand etc. My husband is building a Canopy for the tank, so it won't be visible for too much longer.
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