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Could it have come out of a decoration? I sanded that resin driftwood in the same area where I sat to put the sanatizer and U3 together. Is it possibly important or useful to have?
I'd edit but can't add a pic that way. I found the hole. So yeah there is an open end and the black end has a hole for open and close. . Could it be for the sanatizer? Or the U3?
I'm still lost. I didn't install either a protein skimmer or a power head but on the sanitizer there is a thing like a parascope that has to be out of water and on the fluval there is a Venturi system. No pic. Just says if using Venturi system put the Venturi valve into top of vent. Which I did, but had no clue what it was talking about.