Well I guess I didn't totally understand how a wet/dry system worked and made a mistake in my sump design. Problem is that it's now got a 75 gallon tank on top of it and is only accessible from the back to do the work needed to fix the issue.
I used a series of tubs. My initial plan was to try and make something inexpensive. Things don't always turn out the way you plan but in the end I figured I'd have something that was more robust than a $150+ canister.
Anyway, first pic is how it currently is. Second pic is how I plan to fix it by placing another medium sized tub in the large one (already have it, already know it all fits). The light blue is my mechanical media and the green is the biological (I'm using loofah sponges I got 2 for $1 but I plan to supplement them later). My question: Does this look like a good fix?
The crappy part is that I have to drain the tank a bit to move it. I figure I can still move it myself with 25% water left in it (I am strong) so hopefully the fish will only be moderately stressed.
Right now it's not running, I'm using temporary filters (a ****ty HOB Biowheel 330 where the stupid wheels get stuck) and a Fluval submersible, largest they have.

