The good thing about the plants you have choosen is that they are really sturdy, if they dont thrive you will usually have plenty of time to figure out things. Other plants might just «die», but these willl show stress signs way before they go. My experiences with Java Ferns is that they really love potassium and iron. They were just in stress mode when I only used Tropica Premium Nutrition fertilizer, it was when I started using Seachem Iron / Potassium in addition that they finally began thriving.