My RG will pretty regularly take a run at both my Zoas and brush up against them in the same spot repeatedly. Not nipping at them, but rubbing them and then those polyps close for a few minutes. I have a Green Star Polyp and a Hollywood stunner that he won't bother. 32 gallon biocube. Water parameters are good. Nitrates and Phosphates are not detectable. I buy Red Sea water from my LFS. Tank is 30 days old. Had the RG for about 2 weeks. Just seems like strange behavior. Other than that he seems fine. I am pretty sure I cannot likely change this behavior, but, any thoughts?