Opinions on my sump setup please

[gregzz4]

Can't see enough as your pic is dark
Speaking as one who is now working on a 2nd sump build, I'll say;
Try to maximize your space while keeping it simple.
Having removable socks that aren't obstructed by hardware will keep you happy to perform regular maintenance.
Keep access to your skimmer and reactors open for the same reasons.
Can't say much about the new blocks you are using, but have read good things about them

The deeper my return section is, the quieter my pump becomes

[Potatohead]

If you are using the refugium as a refugium, I wouldn't put the block in there. If you're just using it as another chamber, no problem.

[DemonicReefer]

I tried to upload more pics but would only let me do one pic. And nope not doing a fuge trying to have a clean and low maintenance system and don't need the pods or anything for my fowlr tank. I figured bio pellets would be my best choice for large bio load and a low nutrient system??

[Potatohead]

Bio-pellets or carbon dosing is fine, bio pellets are certainly less maintenance. Those blocks will work well with either method, too.