jimwat
Premium Member
I've got a foxface that eats it and a LM that occasionally nibbles. I've never seen my emeralds do much damage and I've had a sea hare that tore it up.
Anyway, it is best to attack HA from all angles. As already stated, critters can be hit-n-miss for controlling HA. So like Hop said, you should also be looking for ways to reduce the HA nutrient source.
FWIW, I have found that HA is more sensitive to changes in my lighting than my corals (softies, LPS). When I had my last outbreak I turned off the lights for a few days and then backed off on my light cycle. My HA started dying off, the corals opened right back up, and the fish were indifferent.
Anyway, it is best to attack HA from all angles. As already stated, critters can be hit-n-miss for controlling HA. So like Hop said, you should also be looking for ways to reduce the HA nutrient source.
FWIW, I have found that HA is more sensitive to changes in my lighting than my corals (softies, LPS). When I had my last outbreak I turned off the lights for a few days and then backed off on my light cycle. My HA started dying off, the corals opened right back up, and the fish were indifferent.