I recommend 1 SW and 1 FW. They don't have to be giant....like each 75 gallons.....You can have all kinds of lessons around the two. Maybe make the FW a planted tank.....Have the SW with some interesting inverts and a few easy fish. My daughter is in univ, and she said she would have *loved* that in her class.....If they're smaller in size, water changes are so much easier--especially if someone else has to do them.
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