I have had a couple of planted aquariums set up for a few years now with easy plants like anubias, Java fern, and unfortunately duckweed. (For now. I'll win that battle eventually.) I have had an issue in the past with plants like Amazon swords, cabomba, and some crypts melting no matter what tank I put them in. I have never tested my GH or KH and just happened to pick up a test that tests for GH and KH. While my GH sits between 30-60 ppm, my KH is through the roof! The maximum the kit tests for is 240 ppm and it's definitely reading that. Though my guppies do great I am concerned that this may be what is causing the melt on some other plants. I want to set up a mid-high light tank and advance in my plant keeping. Should I try and bring the KH down with RO water? Could this even be what could be causing the plants to melt?
I'm on a well and dosing flourish as well as dosing added potassium as my water/ground tends to be deficient in it. When I had the crypts and amazon sword I was using eco complete as the substrate (as well as a well fed guppy horde) to fertilize my root feeders so I don't think it was a nutrient difficiency.
pH 8.0
Any thoughts and tips are much appreciated.