New set up, need advice

[freezetyle]

I would probably shoot to have a larger sump. In the case of a power failure you want the excess water from your display tanks to be able to run off and not overflow into your basement.

[hillegom]

I would switch your skimmer and return sections. Split the overflow water and have one of them go to the macro algae part. I would have this overflow empty into a filter sock on the right hand side of that refugium. Raise that tank so it is the same height as the other. This way, having a power outage, it would not spill onto the floor.
Add a ball valve onto one of your returns so that you could adjust the flow.