I haven't been very good about keeping on track here with this thread, but here's a late update.
The duckweed and hornwort died, it all melted away slowly but surely, and the duckweed had driven me nuts, it really does get everywhere!
I am not having the best luck with my bettas, one died, and two are suffering from swim bladder and fin biting, my only healthy one is my male OHMPK.
The bettas are going to be scaled down, all my tanks are now ten gallons or under, the 20 gallons long is being shut down for now, with no future plans to set it up again.
My live plants also started to show signs of troubles, so I sold them to a nice person I did business with.
I am now keeping the two sick bettas, after the swim bladder is fixed, in small cricket containers which are just the right size for them, and will be adding almond leaves to give the water tons of tannins for healthy growth.
Although these tanks are only 2.2 gallons, they just might work out because of the betta who keeps fin nipping, his tanks have always been way too open, and I am hoping that this is the fix to his issues.
It's not been easy, losing Luna for the second time, but we are moving on and hoping that things will be better later, it's been so odd recently.
I will be back on here after a couple days to post another update, but for now, I have to do a lot of consecutive daily basis water changes with the salt and all the works, it's almost hard to keep up, hoping to catch a break soon.