Gee that's a tough one. I'll presume you have the ongoing budget to cover any of the options you laid out so, if Ignore cost..
-The best educational experience would be the one that best duplicates the ocean so I'd say reef. If we say reef then I would say 4' simply because it's more manageable.
-From a practical perspective, a reef tank is hard enough to care for when you're around regularly but when you're not near the tank for days on end (long weekends, summer holidays) so I'd wonder if ANY tank is really practical but I suppose a FOWLR would be a compromise of sorts. Still risky IMO.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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