Perfect Neil.
All us Alpha testers searched for days hunting those, glad you found one we missed.
You are correct in that those are actual holes. Those are the reason why the coral can't be resized or changed. It had to be placed perfectly so those aren't there as the camera pans. Any changes would result in tons of those being everywhere.
PS. Don't worry, background movement is planned and those won't be a problem for that.
Nice job