I'm sorely tempted to set up a local tank. Beyond an overpowered chiller and probably styrofoam on the sides, back, and bottom to help keep the water cool, I don't think there'd be that much more involved. Like bnhreef said - any critter that you'll find in tidepools in the summer will probably have a very high threshold for temperature and could handle the tank, and hopefully you'd have the tank a little cooler in the winter to help simulate their cold period.
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