Sort:  

they get the majority of their nutrients from the air, hence that's why they are called that.
https://www.hemleva.com/airplants/

ah.. got it.. thanks

No need to water them so often 😬

Ya.. and the fact that it sits beside the aquarium helps.. because the moisture from the aquarium helps "water" the air plants

Never thought of that, actually! Lol. Nice one