Tube coming out of mushroom?

adoyle983

New member
46 gallon bow front. 20 gallon sump with coralife 75 g skimmer fluval 406 canister all water parameters are good. What is the tube coming out of the mushroom I have never seen it before and have had this coral for about 5 months now. Thanks in advance I'm a newb. Hope I posted this in correct spot.
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