bubble coral sweepers

This is a pearl bubble asking for food...or quarreling with a neighbor. I think it's food, because it's daytime.

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It's not as much a specific distance as it is size of the polyp and the strength of the flow. I just mounted a sea swirl in my tank, which I think improves their behavior, more chaos, less blowing straight downstream.
 
That should be fine, mine stretches about 4"-5" when sweeping. The bubble is between a baseball and softball size, closer to softball size.
 
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