My other problem that I seem to have (and I think other radion users have too) is the fact that my acro polyps only seem to come out at night. I don't think this is a big issue, I'm just curious as to the reason. I do have a yellow clown goby but he doesn't nip, just perches on acros. He actually does this during the night too so I don't think that is the reason they are not out in the day.
This is the first time I've heard this. My SPS have great polyp extension and I know a lot of other people running Radions over SPS and also have great polyp extension during the day. Do you have any Butterfly's in your tank?