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These are vermetids in addition to colonial hydroids which multiply when there is food available and they love brine shrimp. Simply directing flow towards them and not at them will starve them. I simply cut them at the base of hydroids with a nail clipper and discard. For vermetids, break off at base with a pliers and also discard and rinse and dry pliers to prevent rust. For vermetid, other option is gel super glue from the dollar store- Place a dab over each tube opening and they will starveAlso, the little hairy things??? Thanks.
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