IF hose is leaking below "crimp ferrule" it mean inner structure of hose is damaged at that point.
You can take hose to welding supply and see if the can repair end by cutting off bad section and re crimping end fitting to "new" section of hose with new crimp ferrule.
OR you can curt off crimp ferrule with a file or hacksaw, cut back hose to a fresh section and put barbed end fitting into new section of hose and apply a clamp you can get at local hardware store store.
IF hose is old and scaly and starting to shed hardened rubber "dust"... Maybe you should just replace hose.
You should ABSOLUTELY NOT have any Teflon tape at any connection on this tank and regulator. The connection are designed to be METAL TO METAL seal and if connection will not seal it is loose or damaged. TELLON tape is not a fix. See yellow arrow on picture.
Dale
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San Francisco - A Few Toys Short of a Happy Meal