When I first walked into a Montessori toddler classroom it surprised me to see a fish tank located only inches off the floor. Were they crazy? Surely that's dangerous! I guess I had a lot to learn about Montessori.
Over time I witnessed many children putting their hands into the tank, many times the glass lid fell in and occasionally children would fight over who got to feed the fish. But what was learnt in the process? So, so much. The benefit of having such an accessible fish tank clearly outweighed any negatives.
While at home I loved the idea of keeping fish (and a mussel, and aquatic snails) I wasn't so keen for such a low fish tank. This is our compromise. The tank is still easily viewed by youngsters but they need to stand on a stool to reach the lid.
What child doesn't love to feed fish?