Thanks for the responses guys!
Yoimbrian, for the mechanical I was thinking about using a media sock at the inlet and then a foam block after the bio media.
brich999, great ideas on plumbing the uv sterilizer in-line and including mechanical over the drip tray to disperse the water, I'll certainly do that instead.
Redearsunfish, I'm certainly open to ideas. Can you explain why you would rather flow water over a bio-wheel? If I were to use the bio ball space for ceramic media then I would design the sump to have a higher water level, which would be beneficial. I was just under the impression running water over bio balls in a wet/dry environment would be more efficient than running water through ceramic media in a purely wet environment. What is your input on that? And for the drip tray I imagine with enough holes it could keep up with the flow. However, from your statement I seem to be forgetting something?
Thanks again everyone