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[Delphinus]

Tide idea is kinda interesting but I wonder if you'd really get much out of it. The problem I see with intertidal critters is there's nothing really keeping them in the tank unless it's sealed off (cover glass or whatever).

The Ucluelet Aquarium Society has a coldwater SW display tank at the Wickaninnish Interpretive Centre and it's an awesome setup. I'd love to try coldwater someday.

The main concern I've always had about coldwater setups is the sweat on the glass. Thicker walls are needed, although I've seen public aquaria that simply had fans blowing on the glass to keep the condensation under control, so I guess that's an option too maybe.

Funny you mentioned this, by coincidence, I was just reading about Steve's setup earlier this evening. I don't see a whole lot of info on his oregonreef.com site though, but there are pics in threads on RC.