So, i got a whole lot of equipment from the seller, some old and some new:What pump? What skimmer?
This is my alternative version based upon your input (Mesh is just stopping unknowns getting to pump),Water wise that looks fine. I would remove the sponge under the return baffle though. The media you have should probably be researched more. That is a very old school method that modern reef keepers have gone beyond for various other methods. Skimmer is normally a good idea but sponges, bio balls and ceramics are not nearly as common. And carbon is only run as needed vs all the time.