Aquarium in baby's room?

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My daughter was born in Aug and has had a 20 gal FW tank in her room since she was born. At 7 months old she will wake up and watch it for hours. The tank also helps with the humidity for the room, babys like it warm and moist. I have a hard time believing that anything would escape the tank, along with the evaporation so I don't know what the concern could be!