black dots?? are your clowns rubbing up on zoos or any other corals? I know that this will definitely leave black spots.. not a bad thing though, don't worry.. they do get stung from zoos and possibly other corals (because they try to host them...)
__________________
20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
|