nice setup jaws. I ordered 9 lbs of ceramic media separated into 3 bags. I was thinking of making baffles so the water will flow directly through the media instead of just flowing around it. and then have a bigger open area and using sand and some moss balls or some small, hardy, low light plants to take care of some nitrate between water changes and to learn about plant care at the same time.
You can do that but it's really not needed. The whole system acts as a biofilter. Sand, decor, media ect ect. When I 1st got into sumps I was the same way. All about direct flow until other members chimed in. Don't get me wrong they do have their place say in a refugium but aren't as needed as we think. Just put the bags over the intakes of the pumps and your fine.
When I have time I can send you a bunch of build threads that are baffleless. Actually you should spend some time in the filtration section. Tons of useful threads and the regulars are really down to earth