Snails will take care of it all for the most part. Many reefers avoid hermits. They are wonderful critters but it become conflicting when adding them with snails. There is no doubt in mind that they will kill your snails.
But i will tell you what youve heard many times and will continue to hear it. CUC can only do to much, they are benificial for keeping a system stable from nuisance algae but wont help much with majoy algae outbreaks due to other problems such as bad water, phospates, nitrates, etc.