Sulfur Deficiency

I just found out what was wrong with my plant. Although it is still healthy, how serious is Sulfur deficiency?

Symptoms of my plant:
1. Burning of tips
2. Leaves vein are green but yellowish overall
3. Purple stems
4. Tips point downward

I am not sure how serious this is.
Is it correct to lower the PH level to solve this problem?
Should I actually go out and buy Nutes with extra sulfur?

other water in leaves pointing down for sure and seem u got nutburn too if there going yellow

I have only started using nute, so it's not nute burn. Could be over water.

But I though it was deficient in sulfur because the stems are purple. At first I though it was normal, but it's a symptom of sulfur burn.

Everything points to deficient sulfur, am I wrong?

Bump,Im having the same problem and have never got a real good answer, for me i thought it was a phosphorus def. so i went and got 0-12-4 organic mix and it seem to help mine out a lot but not sure if im right about it, I just know that it seem to help them, another quick thing is when i starting new plants they love that 0-12-4 mixture.

http://images.google.com/imgres?imgurl=http://www.gardenscure.com/420/attachments/plant-nursery/209849d1186314471-nursery-troubleshooting-guide-nutrient_chart.gif&imgrefurl=http://www.gardenscure.com/420/nursery-reference/105126-nursery-troubleshooting-guide.html&h=335&w=600&sz=32&hl=en&start=21&um=1&usg=__F3KMhnmZITGTZH2eDhbOvR_DScE=&tbnid=IEsbmNB-iJNiPM:&tbnh=75&tbnw=135&prev=/images?q=tomato+leaf+chlorosis+picture&um=1&hl=en&sa=X

http://www.weedbay.net/overgrow-thebook/SoilandSoiless/1675.htm

Im having the same issue right now and its because I ran out of the trace elements for my feeding program. I am going get the trace elements I will let you know how it works out.