Which tank are you putting him in? If it is the little wall tank that Floaty was in, you will need to change the water every day. That tank is too small to go without a daily water change. If you keep a jug of water pre-mixed and ready to use, the changes will go fast. If it is a bigger 2 gallon fishbowl, then yes, you can change the water every other day but no less than that. Hope this helps.
