686 is a line of snowboarding apparel.
COINCIDENCE ???
686 is also the last 3 digits of the Ramblin' Rose's registration number on the side of the boat (full registration # is 59686). Until seeing the above answer, I always assumed the 686 stood for that, but Elliott does snowboard in his free time - (Elliott Neese is captain of the crab ship 'Rambin Rose' on Discovery Channel's "Deadliest Catch") - I'd guess that he is probably paid to advertise and wear those 686 brand clothes on the show. That's purely speculation on my part, though. I don't have any facts to confirm or deny it.
Well you can give them tap water but you need a sponge. Fill it with water, nice and full and set it in your crabs cage.
King crabs are omnivores so will eat plant and animal life alike. This diet often includes fish, algae, plankton and seaweed.