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The female has been in QT for about 80 days now.Did you QT the female clown after the velvet outbreak? If not then the clown is still carrying the parasite and it will infect any new fish you put in the tank. So make sure that is taken care of first. Velvet is a super quick killer.
As for the fish, the problem is you are going to need an assertive fish and I can't think of any options that will work in a 15 gallon. Definitely don'tt add another clownfish. Generally it's best to add pairs from the same batch as they tend to pair up more. I agree that Damsels wouldn't be the best either as they are from the same family. The tank is on the small side and I can't believe I am going to say it but maybe a captive bred Orchid Dottyback is the way to go. They tend to be a bit better behaved than most dottybacks but they can definitly hold their own against an aggressive fish.