I don't know what the deficiency is but heres what I'd do. Flush your plants asap with 3-4 times the volume of the plant pot and then water with a mild (1/3) strength fertilizer... No epsom salts. I think that you have a toxic salt buildup from adding the Epsom salts. You really need to flush them out as they will lock your plant up completley.

The problem could've stemed from using well water. It's hard to tell whats in your well water. I'd switch to tap water and unfiltered. Tap water is really quite good for your plants, gives them a few trace elements like Mg and Ca and doesn't usually need to much altering of ph.

Hope it gets better mate
Wobster Reviewed by Wobster on . Problem with new growth I have a problem with the new growth on my plants. The tips of the new growth are turning yellow almost white. They are in the fourth week. Planted in MG Organic Choice (I know I know). 400 W about 15 inches up from tops. I have used 1tsp. of Epson salts/1 gallon water twice. No change in the last few days. Seems that they have slowed in growing as well. I haven't fed them any nutes as of yet. I do use well water, could that be harming them? The PPM could be high. I have searched but seem Rating: 5