what to feed blue/pink spotted goby? b4 he eats the rest my fish!

[Reef Puffer]

so i love this little fish but its like i cant seem to keep him full. he eats everything i put in the tank every time i put something in it (including my hand). he just tried to eat my marine molly (grabbed her by the head!) and has already cleared the tank of molly babies. i feed him mysis and brine but i wonder what else i can feed him? can i go to the grocery store and grab like raw scallops or some thing? i find that the small shrimps just spread everwhere in the tank and he has to work to collect them all. was looking for something possably a little larger that he can chew on for a while and will maybe hold him over for a bit.