given its been 2 weeks, did the clown end up with brook? if so, I doubt it is still alive... but figure I would still leave this here for future reference...
If ever in a spot where you don't have the meds, dose hydrogen peroxide, (3% stuff from walmart works just fine. dose daily for up to 1 week (I dose 80-100ml/day in a 400 gal system, so basically 1ml/4Gal with positive results.
given some meds these days seem impossible to find, I found an alternative on Amazon that worked well for me called Rally pro. which can even be dosed directly in tank and does not harm corals either.
https://www.amazon.ca/dp/B07Y9GLBBN/...NsaWNrPXRydWU=
hope this helps.