I think a biocube or similar in a classroom would be ideal.
I also propose a smaller sized tank for a couple of reasons. I agree that it is easier to move/disassemble in the event it is required. Also, it is true that something foreign may unwantedly end up in the tank, for this reason I believe a smaller tank is easier than a larger tank. True a larger tank is more stable, but in the event you need to do a significant water change, it's much easier and economical to change 20 gallons than 90.
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