Treating Clown Popeye Ammonia Help

Unfortunately I'm not familiar with the particular medication. If the medication is meant to be used daily, then add it right after you do a water change. If instead the medication expects that there is a minimum duration of some number of days between adding doses, you can try to scaling back the dosage to a daily amount that can be added after water changes.
 
You can also use ammonia-binding chemical products to lower ammonia levels in an emergency, but make sure the product specifically says it works with saltwater (and, of course, water changes area always better when possible). Some products that bind ammonia include a lot of other things though that can sometimes neutralize medications. For example, Prime is my preferred emergency additive for ammonia/nitrite when an immediate water change isn't an option, but I'm not sure whether it would cause problems with myaxazin.

 

 
That's what I was referring to in my previous post as an ammonia binding product. They can be used in emergencies (again, make sure it works in saltwater), but doing more frequent water changes is preferable though if you can keep the levels in check with daily changes.