White-brown sickly leaves. Help!

My plant is suffering from something but I'm not sure what. The leaves are all turning white and brown with discoloration on the edges. :eek: It's happening uniformly over the plant especially on the new budding leaves. :(
No problems whatsoever up until flower and then suddenly this happened. I have a soil mix of 3 parts dirt, 1 part worm castings 1 part perlite, 1 part vermiculite, 1 part peat moss. I water when it gets completly dry and it drains well. I use a light fertilizer maybe once every 4th or 5th watering and use a little bit of liquid seaweed sometimes. Could this be lack of magnisium? Please help save my baby! She's too young to die....

Bingo, It is magnesium. You can treat 2 ways, Water with 2 teaspoons of Epsum salt ( magnesium sulphide ) per gallon of water. If you want fast results, spray foilage with a 2 percent solution of Epsum salts. Your plantw ill green top to bottom, keep treating until the green is good :D.

I live in Japan and unfortunatly I can't find epsom salt out here. Is there anything else I could use as a substitute? I can get sea salt or rock salt. Would those work too? :confused:

Most pharmacys and grocery stores sell epsom salt check there.