i dont know about reds but i have an emerald in my fuge and i also have radioactive dragon eyes in there and he doesnt touch them, he gobbled up all of the hair algae and other bad algae on my chaeto and stuck on the baffle, every now and them i scrape the glass for him and he comes running out for it. so in my experience my emerald crab hasnt touched polyps but this is mine for one, he is also not in the display for two.
just trying to spread some thought on this, ive read few good things about the reds but i would think if they were so great how come they hardly carry them anywhere?