That's a fairly simple setup but I like it! How big did you say the tank was? It looks a little small in the pic but then it does not look like you can see the whole tank either so looks can be deceiving. My only concern is the stacked slate rocks. Make sure they can not slide or be knocked off balance by the FBT's. I would be afraid that one would get crushed under the slate if it moved, but so long as they are completely stable they are safe. The setup is very nice though, good job! I am sure you will have lots of fun rearranging the design, I know I enjoy it when I redo my Grey Tree Frogs home.