my borbonius anthias has been showing signs of white poop and fin rot for close to a mth, but he has always been active and have really great appetite everyday until my 1st dose of Kanaplex+GC+focus medicated food yesterday. today i notice he's hiding in his own nest and not coming out even when lights on which he always does on a daily basis for a year. is this normal after having medicated food? or should i b worried? other fishes that took the same food r swimming happily today. pls advice