We were told that they don't need dry land, just a way to get to the surface for air, which they can on drift wood and our plants that touch the surface, not to mention the cord on the heater and air pump, so we have that covered. At the LFS
they are in a tank with just a piece of wood sticking out so no worries.
We do add aquarium salt to the tank, is that not enough? This didn't seem to be an issue when we were asking questions.