I have a little experience with low tech planted tanks filled mostly with anubias and java fern without any problems. About three months ago I upgraded to a 30 gallon high-tech setup with a lot of the plants, but some of the ones I've been getting seem to be having trouble, particularly crypt wendtii, bacopa, and surprisingly some anubias isn't holding up too well either. All parameters tested using my master test kit are looking great and I follow EI dosing, didn't know what was wrong until I picked up a GH/KH test kit and saw that the kH readings are over 300+ ppm. Does anybody in the area know if the high kH could potentially be the cause of my issues and know how to manage it? I'm looking into getting an RO kit and use an RO/tap water mix when doing my water changes. Is that necessary?