Is this aquarium set up okay?

I have a 5.5 gallon tank with a 5 in tall divider down the middle of it. On one side there will be 5 inches of sand and then a plexi-glass ramp into 5 inches of brackish water. There will also be another ramp travelling upward from the divider to a plexi-glass platform near the top of the tank to provide more room. There will be one inch of sand on this platform. A cover will be placed on the tank. On the water area I will place about an inch or so of aquarium gravel and a moss ball. The animals that will be living together in this habitat are a Red Claw Crab, a Fiddler Crab, an African Dwarf Frog, a Mystery snail, and 5 ghost shrimp. I will have an indoor plant light set up to warm up the water. How does everything sound?