One of the neatest experiences was down in So. Cal, where one of the various *lands had a swimthrough tank. You suited up in a wetsuit with a snorkel and you could take your own time, just couldn't back up. So knowing marine aquariums, I just waited until the various hordes passed, then sank down to rest against a ledge or the like, until the little guys would come out of their holes. All the familiars from our reef tanks, and in their element. That was neat. I was pretty prunish and cold by the time I got out, but what a time!