there is one large 10 year old bnp in there, root tabs in the substrate and ive tried the aquarium coop liq fert and also done a 70% water change and added charcoal to remove it, neither way made any difference. never did have good luck with plants in this tank, always have good luck with sunlight, but alas, spouse doesnt want this tank moved . in the tank where this val used to be it did sooooo well and grew so fast and algae free, i ONLY used root tabs, sun light and fluorescent bulbs