‘Antisocial’ damselfish are scaring off cleaner fish customers — and this could contribute to coral reef breakdown. Damselfish have been discovered to disrupt ‘cleaning services’ vital to the health of reefs. And climate change may mean this is only likely to get worse.’Antisocial’ damselfish are scaring off cleaner fish customers — and this could contribute to coral reef breakdown. Damselfish have been discovered to disrupt ‘cleaning services’ vital to the health of reefs. And climate change may mean this is only likely to get worse.