I am a relatively new grower, this is a 4 week old pineapple express plant and I added 20ml of a 20-20-20. Brandname is Genhydro. I have a 1gal hydroponic tank. The plant is now dying and yellowing, I flushed the system and washed roots then prepared the plant with nutrient solution suggested by the Genhydro bottle for a vegetative plant with a 20ml solution of 7-6-11. This did not help the plant rebound. So then I changed to pure filtered water with no nutrients and it still seems to be going down hill. No improvement in 48 hours. I know the plant is starving. The stalk has some fuzzy white film near the root base, it has seemed weak since it started sprouting. Is there any way to save this one? And if not what do I do to prevent this in the future?