Yep, that's about it. Just keep in mind that your nitrates are awful high now so a single 30% pwc
might not change it too much. I wouldn't do any now, you're in the home stretch lol.
Macro is usually put into a refugium. I looked at your pictures of your sump on the other thread and I see you dont have room for it. :-(
Also, in regard to your other question on that thread, you have the skimmer where it should be in that setup. No worries there. If you had a refugium before it then you might wanna move it but you don't so moot point. hehe...