Hey Mike. Excellent size build
Having a 'fuge the size of my DT puts things in perspective. Outside of costs and maintenance I'm sure tons of us are very jealous.
I'm guessing each inch in your DT is 20g. How's your new 135g sump hold the back-flow?
Couple thoughts if you don't mind; I'd put tie wraps or clamps on the rest of those barbed fittings, but I'm paranoid.
And if you want to cut down on mulm build-up in the vinyl hoses pick up some split loom. The hoses will stay way cleaner when you block light.
Wish you were out here on Wet Coast so we could look in person.
Keep the pics coming!