twiching foxface

just got done treating my tank with Kent Rxp and then a treatment of melafix. while i was treating i noticed my foxface would jerk/twich his head to the right or left. i did a 25% water change but he is still doing it 2 days later. is this twiching motion caused by the meds or just somthing they do. i have had him for about a year now. he is about 5" and has been hiding more than ever.
 
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