Oh I just realized I was helping you in not your thread :face-with-tears-of-joy:
Sort of TLDR summary that we (may have) covered so others can chime in here as well:
-Bigger sump (tsunami suggested due to cost but any brand is generally fine + doesn't need to be ultra fancy unless those are things you
have to have)
-Since you're utilizing dual returns, one plumbed in a simple manner of all pvc or silicone to pvc would be ideal with the second pump being plumbed all pvc or silicone to pvc in a manifold for reactor(s), UV (if desired), skimmer (if necessary) and finishing into the display (alternatively finishing through uv into display) would be one of the ways I suggest plumbing (you can work out the details later since it's something you don't have to rush into)
-Lighting was determined as a skip on the AI blades as a primary lightsource (unless your research tells you otherwise since I mentioned I have 0 experience utilizing said lights so I can't offer what I would consider to be genuinely worthwhile output) and opt for a more well known/proven light (iirc you decided on the ap9x)
- Returns were determined to be 1" to match the presumed output size of the sicce sdc 9.0 (switch to 1.5" if it's 1.25" to reduce head pressure restrictions) and utilize 1.5" drains x3
-I went with the over kill 1" material on my 96x36x30 but from the general conversation of people much more knowledgable with acrylic than myself it seems that 3/4" would be fine per
https://www.reef2reef.com/threads/crystal-clear-what-is-your-opinion-of-acrylic-reef-tanks.969783/
-Recommended seeing other 30"+ tanks to see how it may feel to do maintenance on said height since it is likely a challenge for most which is further amplified by stand height (sad because the taller on both ends generally the nicer looking but at what potential expense?)