dont add anymore medicins to the tank untill everything comes back to normal adding things to an unstable tank is a whole new problem that you dont need
**** edit****
dont add anything to the tank right now for a bit thats not ran on your reef aquarium on a normal basis.
no buffers
no meds
no dosing
if you like you can run carbon and is a good idea
right now just test and do water changes it will stabilize on its own in no time in a 30g