I was hoping to have all the plumbing done today, but when I added the algae scrubber into the fix, it caused me rethink my plumbing. I was going to run the carbon reactor off of one return and the algae scrubber off the other, but thankfully I installed the platform and algae scrubber...I used some sch 80 pvc to hold of platform, it will be blue pvc as well...I found that I had no room and I would have to over complicate the plumbing to maybe make it work. So I will just run both, the carbon reactor and algae scrubber, off of one return pump. Pics are below, hopefully you will get some idea of what I am planning. I will install another tee just after the left return turns to the left. Then I will install a short piercing pvc to extend it and 90 it upward. I am doing this so the plumbing will run just inside of the steel stand structure. After the 90 I will install a ball valve and then run it up to the top and 90 over to the scrubber. This run is where I will install the flow sensor. Also, I am trying to brace every piece of plumbing I can to keep the unions from leaking. I will epoxy some wood on the top of the inside of the stand, that way it will give me a little more wood to screw supports in for the pvc that will run along the ceiling.