Working on getting it down more but it's finally dropping after well over a month, it was a constant 4.0. Thank goodness for amo lock. It's all the old plant materials and fish food and other stuff in the gravel still breaking down from the last time the tank was running. My husband was a heavy handed feeder. I only feed once every 3-4 days and he's not allowed to feed them any more. I vacuum the gravel almost every time I do a PWC and it is just I have very dirty gravel. I need a turbo charged gravel vac. l half temped to rent a wet vac lol. My plants are doing well, and I do take them out and remove the parts that are dying one a week. Being more careful on what kinds of plants as well. So the tank is improving. Just so slow. My bio bag is falling apart so instead throwing it out (my hubby did that last month) I filled the new bag and clipped the empty used one to it to help as not to lose any helpful bacteria. I hope that was the right thing to do.