Alright first off never dust fish they dont need it. Secondly he perfers the fish.. if he gets hungery enough he will take crickets, he may be just to lazy to chase them down so you may want to feed him with tongs.
Not all pacman will freak out when you get near them, mine personally is cool till i try to lift him up, it depends how accepting your pacman is of you and how often you try to handel him. I dont suggest handeling a pacman tho unless you wear latex gloves or wash your hands VERY well before you touch them.
If you want to get your little one use to you just get your hand closer and closer each day and lift him about a inch above the substrate each day till he starts to get use to you. keep handeling him close to the substrate for a good while tho cause if you take him out he may jump to his death! Also keeping them in the tank while you train them like this gives them a sense of security and warmth they dont have outside the tank.
Also word of the wise! They do have teeth, if training them they will more then liekly bite you at one point, dont flick your hand or anything when they bite tho keep calm and still or you will fling them intot he glass and kill them or brake allot of there bones. If you are bit just pry there mouth open if they dont spit your hand out quick. If your afraid to get bit either dont handel them or wear gloves for safety as you train them.
Last of all hes not unhealthy, hes just like jaba da hut.. a layed back player and i wish i owned him lol.