Melafix - dab or dose?

Hi all,
I have a fish in quarantine with a bit of damage to his dorsal fin that doesn't seem to want to heal. I figure it is probably a bacterial infection, so I acquired some Melafix to treat it.

My question is, shall i dose the QT, as it says on the packet, or shall i net the fish and dab the melafix directly on the affected area, as my LFS suggests?

cheers
 
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