Fish can go a week or so with no food..they are cold blooded. If your water parameters are good...just let him be and he will recover. One question is when Thermometer broke..define broke...inaccurate or did Mercury get into water...if latter then yes you would need to do 25%-50% water change over the next few days
i had arrowana that heater busted on me...it took him a week and half before he started eating again
i had arrowana that heater busted on me...it took him a week and half before he started eating again