These were installed for about 10 minutes on my new XR15 G4 Pros. I took PAR readings and they Reduced PAR too much for my liking, even at 100% AB+ setting. My tank is 36x30x24, might of been fine with a couple more XR15s, but I dont plan on adding more. It did reduce the shadowing, but I honestly wouldnt run the diffuser on anything taller than 20 if you are keeping acropora. $80 shipped or $75 pick up close to USC Health Campus in LA you tomorrow 1/29.
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