Circulation for a 210 gal

[Ruth]

Very nice set up. I love in-wall tanks and it looks like you have lots of room to add additional equipment.
I am sure there are others far more knowledgable than me that will jump in here but my initial comment is that you do not have enough flow in there. In my 230g I have a closed loop run off of a Mag 24, my return from my sump/fuge which I cannot remember off the top of my head but not serious flow. In addition I have 2 Tunze 6100's on a controller. This is not what I would consider a high flow tank and I have mostly soft corals with a few LPS.
My other comment is that you may be underskimmer but that is just me and I am a believer in overskimming as I like to feed my fishies (too much probably)