Gobiodon histrio forms a symbiotic relationship with Acropora nasuta out in nature by removing algae from around its colony. In aquaria, they actively remove red bugs from infested acros. I've used them and they do work on red bugs. They will not eliminate them totally, but will reduce the number of red bugs so the acros are not negatively affected. I have no data that suggests that they have a negative effect on AEFW populations....................Jim