My azolla has turned vibrantly green and is flourishing, I've learned a lot, and now it's extremely cheap with this setup

I just did a fresh water swap, added tiny amounts of the potash/phosphate liquid fertilizer, and the iron chelate. The azolla is near ideal growth rate and is a vibrant green color. I am starving the water of nitrogen so hopefully that reduces the growth of algae and the remaining duckweed.

If you are interested in growing your own I'm happy to help, ask any questions you're interested in. This is a beautiful plant that is extremely strong once given fair conditions. It can grow in a few centimeters deep water with no nitrogen and low light.