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I too have noticed the red ring, mainly on purple monti cap edges. I noticed them the most when running 10k's. Makes it look like the edges are glowing. I agree with sparkss, something to do with the light refracting from the coral.
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I would tend to agree with you, but my coral has the ring right now with the 10ks off. I have a Super actinic, Aqua Blue, Blue plus and 6500 T5s on the tank also. I am still getting it off the T5s so I can't attribute it to light refracting from the 10ks only.