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Is it leaking from the barb where the tubing connects to the elbow?

Attempted to align the elbow better with the 1” tubing and am still getting a tiny leak so I had Morgan send me a couple of new elbows to try a new one and it would be nice to have a spare.  Included in the package was a cone shaped gasket of sorts that is not currently a part that was being used.  Any suggestions on how to best use that as maybe that will also shore up my leak?