Rangers2

I recently set up a newt tank. Its a 55 gallon aquarium. I have the water down about 4 inches and have a floating turtle dock which I purchased from a pet store. I have live and fake plants, some guppies and ghost shrimp. The newts I bought are about 2 to 3 inches, and still red. I was hoping for them to be green phase. Some are darker color and look like they are starting to change. Anyway, will this set-up be ok? Can red efts swim back up to the floating dock? Can they even swim? Thank you for any input.