For the classroom keep it simple. fluvial edges are nice but cost around $100 for a 6 gal tank.
Get a 10 gal tank, glass top w/ aquaclear 30 simple and cheap
4 nice pieces of LR and viola.
My 2 darwins, 1 mandarin, an 10 inverts been living in the same tNk for 6 years. Top offs are 1/2 gal every week with minimal evaporation
Ken - BWA
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