People often think their plant is melting away, where the old leaves are actually just dieing off, usually because of a move between tanks. Stem plants arent 'dead' until the stem has rotted away. Even if it looses all its leaves, keep it in the tank and see if it will grow. Ive never had a problem with cabomba, and i find it does well in low or high light, ferts or no ferts, co2 or no co2 :lol: Its one of those grows in anything, hard to kill plants for me.....