The tank is up and running. Only one minor drip and it was just a pesky cheap ABS bulkhead that I was using to plug up the two return holes I had drilled for returns, just in case I didn't like the Sea Swirls. Anyway, I just changed out the bulkhead rather than fight with it. No more leak.
My reverse check anti-siphon valves work ok. Yesterday one of them wouldn't completely shut off while the pump was on. May have had some trash in it. I took it off and fiddled with it and today it works. I tried the RFG nozzles on the Sea Swirls and since the 90° is so close to the surface, the nozzle was sucking air. They are 3D printed and they don't seal well over the LokLine conversion fitting that you need to attach them to anything but LokLine. I bought some other 3D printed hose clips from the same company that sells the RFG nozzles and they all split on their own with RO hose in place (what they are made for). I am just not sold on 3D printed stuff for durability. one of the RFG nozzles even split in the mail and was replaced.
With it up and running now, I can add components one at a time and start getting the thing cycled and begin adding stuff a little at the time. A deep sigh now that there is water surging through her veins.
A few pics...