White spot on my chalices..

Keep an eye on asterina stars, ( I see few), most are harmless, where some other like blue and red are known to munch on coral.
 
Keep an eye on asterina stars, ( I see few), most are harmless, where some other like blue and red are known to munch on coral.

From what I can tell (and anecdotal evidence from the internet) the colored ones are actually colored because of the pigment of the coral/algae they consume. If I see any star that isn't white, it gets trashed ASAP!
 
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