Problems With Leaves! (Picture)

The lower sets of leaves have started to turn yellow, some of the tips of leaves have curled up and are crispy and brown. also the stems of the leaves are turning purple. What is this and how do I fix it.

I have only given then a small amount of nutrients and my PH is good.

Is it just me or is there no pic?

heres the picture

How old is that plant and what kind of lights are you using.

its about 5-6 weeks old and im using a 400W HPS

Looks overwatered a heck, try spreading out your watering frequencies to a couple days apart, dry cycles are benificial and key.

how many plants do you have in your area? those plants have a big gap between nodes. but yea looks like overwatering and maybe nitrogen. you still veggin?

I would have started those with 6500k CFL's so you can get some of that blue spectrum. Then I would have added the HPS a week before flowering. Im using CFL's and I have way more foilage then that.

have 5 plants but only 3 are female and yes still in veg.
ya k good to know because I had them under CFL’s but put them under the HPS after like 2-3 weeks.

So you only think its over watering?
Because I was looking on the internet and it said that it could be a Sulfate deficiency ??

On the CFL's you want to keep them about 2-4 inchs from the plant.

Looks like alot of problems there. Lot of stretching did you keep thecfl or flors right on top of the seedlings looks like light was to far. Is temp 75-80 tops? Have a fan blowing on plants to circulate air? why is it so red in the picture?Pots might be little small also.Whats the ph and are you adding nutes or no nutes? water ph?

if you still have issues with stretching try Bonide Tomato Set Spray, it will initiate more lateral branching and keep the plant bushy even under hps. Kelp extract also helps.

k well this is not a over watering problem!?!?! iv tryed giveing them less water and they just dry up!!

and now all the leave tips are curling up and are very dry??? what should i do??

new pic of my plants leaves