This sounds really interesting. It is interesting how something in your own backyard is "dull" and gets ignored. There sure is some weird stuff underwater here - which draws people from all over the world for diving. But, then I go to Cozumel to dive - and I have the Pacific 2 blocks to the south, or 3 blocks to the east, and hardly ever dive here. (too much gear).
But, it would certainly be interesting to look at them from a nice warm room.
I'm not sure how much you have to worry about supplying warm-up swings in temperature - here where I live the water gets up to about 8 or 9 degrees when it is really warm, and goes down to about 6 - but shallower areas like Brentwood Bay get pretty warm.
Some things should be easy to collect if you dive - it is interesting to see the rock cod just sitting there in front of you when you are diving - if you go off the breakwater in Victoria, you see all sorts of people fishing, with their lines all over the place being completely ignored by the cod. They are so docile you could just stick a fork into them and start eating. But maybe they know they are protected there (no spear fishing allowed but line and hook fishing is OK??? go figure)
How big a tank are you looking at?
John
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