These are all super cool. We have just the spot for an aquarium, but I haven't trusted us to be able to handle the care with our career demands. I'd definitely want a reef tank. When I lived in Connecticut there was a Fin & Feather shop in Middletown that had an enormous reef tank. It had some kind of pump system in the base that provided circulation and tidal action. I would go visit it almost every weekend, and it looked different every time I went. The colors would migrate, and oh man, the critters in there! Spiny crab things, fish, anemones, corals, lots of things I couldn't even identify, it was just fantastic. Now that I've retired, maybe this is something to consider. Does anybody know what would be the average cost for a complete setup, say 100 gallons?