Love this! Very intuitive.they in numbers can smother bases of coral and block the needed light for production of zooxanthellae which is their energy source.
Removal can be accomplished by siphoning them with a 3/8" tubing into a nylon stocking and discard
OR
Add a wrasse such as Yellow coris, 6 line, lunare or malanurus OR even a springieri damsel which will eat them
For the next 2 weeks , look for eggs and scrape off as there is likely some and would be future acoels. Eggs are really tiny
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