sea hare?

the dolabella sea hare is reef safe and eats hair algae. a better option in my opinion is the mexican turbo snails. u need to trim and shorten the hair algae, otherwise they wont touch it.
 
Yeah, the algae is consuming them. Which is why the tank parameters seem "perfect or normal." The turbo snails will help and eat other stuff too. Try feeding a little less and do some water changes.
 
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