Your plants are yellowing from lack of nutrients. Increase the amount of fertilizer and feed them again. This time wet the soil a little more than usual and then allow them to dry out. You might also want to add some Epsom Salts to your mix. Epsom Salts are a great source of magnesium which will green up your plants quite rapidly. Use 1 tablespoon to each gallon of water.
I'm sorry to hear about your CP. Sometimes these things happen. Hopefully a little more nutrients will prevent your leaf drop. If it happens again try to post a picture of the leaf before it becomes too dried up for anyone to be able to see what is happening.
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~ Patti ~
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