If you want, but will tapwater rinsing get rid of "bad" bacteria? There might also be bad bacteria in the tap water, on your hands, on the utensils you make the food with, etc. I would hope that seafood you purchase is relatively free of pathogens, and remember that because something is a pathogen to humans does not make it a pathogen to corals/fish, andconversely, something harmless to us might be lethal to corals/fish. And, unless you plan on screening and blast sequencing every thing that goes in your tank, from dry food, to brine shrimp, to additives to room dust, skin mites, etc., then provided the seafood isn't rancid, I think its probably safe enough.