Solid qt strategy!!!
I had to remove clowns from my tank due to the bigger one being aggressive. So much so the bigger clown fish would start in on any new fish. Once that started the smaller clown would follow along and they would both kill any new additions.
I hated trading them in since they’d been with me for many years. But it had to be done!
Im going to setup a 10g quarantine tank and have ready for the aggressive clown just in case i need to pull her quickly... when i release the leopard. Or, i guess i could do drop her in the sump as a time-out. So far I've seen no aggression toward the leopard while in the acclimation box... and the leopard doesn't seem phased by the other fish swimming around the box. The first part is that she doesn't have any sand in the acclimation box and that's throwing off her sleep schedule...she typically wakes up around 8am and goes back in the sand around 3-4pm!
But, I'm thinking the clown is going to go anyhow. She's beautiful, but I'm tired of being bitten constantly while working in the tank!