help! purple?

alright you guys ever see leaves turn purple?? on one of my baby clones that is exactly what's happening. i don't really know what i'm doing wrong but all of my clones and the super healthy lady i was gonna use as a mom are starting to yellow older fan leaves are dying. i was gone for a week and my roommate overwatered them so it might be a bit residual from that but even before that some of the smaller ones were showing signs of stress and yellowing...help! kiss-ass they're lookin real sad

looks over fert and over watered of the pic plus you need at least 65 degrree at night a nd 80 during the day for good growth plus a ph of 6.5 will keep you out of harms way,also moderate ferts every other watering

i don't think it's over fert probably haven't been giving em enough to tell you the truth. pH is probably a factor i think soils gotten a little too acidic. temps are not a problem

you have a deficiency. They are not over ferted. looks like phosphor.

curled down burnt tips yellowing looks like they were transplanted not too long ago what type soil bunny might have a point

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

1.https://www.rollitup.org/marijuana-plant-problems/132382-deficency-nute-burn-diagnostic.html