Nice deal. Did you check for leaks before adding the sand? I learned the hard way to check for leaks first, add 50 pounds of substrate later. The cherries can survive if you start with a large population and a LOT of places for them to hide.
I think I may change my mind for the cherries, I'm thinking about just doing a nano planted tank devoted solely to the little things. I can actually remember a time where I said one tank would be enough... Ha! I don't know who I thought I was kidding...
We didn't check for leaks when we added the substrate... But today we added the water and while we were filling the tank we looked and have yet to notice anything *knock on wood!*