On the sump, I also forgot to mention that I keep a bag of carbon and a folded over piece of filter pad between the baffles from the skimmer compartment to the return, and a little bag of Purigen between the baffles from the fuge to the return. This seems to force most of the water to go through my media. I use the big open area to the right of the skimmer to dose Ca and Mg every day. I keep the skimmer turned so the intake is away from where I add these supplements. I add my ALK to my ATO, which drips into the drain area. I do find that I can't have the water level in the sump much above 9 inches or it bows fairly alarmingly, but that is what my skimmer is supposed to sit in anyway, so it works out.


