29 gallon over a year old. Crypts, Anubis, sword plants, dwarf tiger Lily growing like crazy but stems plants and any floating plants die off in about two weeks but hornwort does fine. Light is on 8 hour a day it’s a Fluval 2.0starts off low and only goes to 50% brightness for 4 hours then dims down. no red blue or green used. Ammonia 0 nitrite 0 nitrate 20 ph 75 hardness 75 chlorine 0 salvinia minima even died after a week. I also use coop proof tabs and easy green. Any ideas