It's been about a month since my 100% water change, so I did one today. Actually it wasn't so much a water change, but added 75 gallons to my system.
Here is what I plumbed up. This is my 75 gallon reservoir that holds my RO/DI water. I plumbed up a pump to pump to the 75 gallon tank that I hooked into my system today.
Here is the 75 gallon tank that I have hooked up to my system, this makes my system about 325 gallon total water volume. This tank is run inline with my whole system but it will always remain with nothing but the water running through it. There'll be no fish or rock ever in in.
So here is my process for a water change now. Turn off a valve to the 75 gallon tank - shutting it off from the system. Then drain that entire tank into the toilet right beside the fish room. Then turn on the pump from my 75 gallon reservoir and pump fresh RO/DI water to the now empty 75 gallon tank. Put the approppriate amount of salt and other additives in. Let mix for a few hours. Then turn the valve on a little bit to let the water change happen overnight. The next day turn the valve back on full. I'm quite excited about this system. No buckets!
I finally hooked up my bathroom fan in the fishroom to a dehumidistat. When the humidity hits a certain level in the fish room, then the bathroom fan will vent that humid air straight outside. Here's a picture of it.
I am quite pleased with this build so far. I have not yet regretted anything that I've done and I wouldn't change anything yet. So hopefully that's a good sign. Now I'm done with plumbing for a while - maybe I can start cleaning my basement and go return the unused plumbing parts...
Thanks for looking.