Not sure if this is nute burn

This plant is 4 weeks old grown indoors using 4 26watt daylight cfl's. It is watered every 3rd day (when the soil feels dry 2 to 3 inches down. Using organic potting soil and city water. I have only given the plant nutes once and then decided to wait until it got a little larger to avoid nutrient burning. I am not sure what would be causing the leaf edges to burn and the bottom leaves to be discolored and die off. The bottom leaves are more brown/grey than they are yellow, even the new leaves at the top are burned at the end and the "healthy" leaves are light green on the outside and darker green in the center.

pics attached

flush with water until it comes out the bottom and let it dry so the top of the soil is completely dry and start over again. That plant may not yield very much due to the condition of the burns.

jesus of Cannabis said:

flush with water until it comes out the bottom and let it dry so the top of the soil is completely dry and start over again. That plant may not yield very much due to the condition of the burns.

Click to expand...

but it definately is just nutrient burning? also, being that I have not it nutrients but once and very dilute, could my city water be bad enough to cause toxicity? say maybe chlorine or something?

Yellowing of the Leaves (from the bottom of the plant upward)
This can be a sign of nitrogen deficiency or of over fertilization. If accompanied early by browning and necrosis of the leaf tips then you may be over fertilizing. Adding extra fertilizer when you are already over-fertilizing will kill a plant at any stage of growth so it is safer to flush the plant (if using a pot use three times as much water as your container size) with clean water to remove the excess nutrients. If this helps then excess nutrients are the problem. This could be because you are feeding the plant too much or if later in the growth cycle could be caused by excess nutrient salts building up in the soil. If this does not help then you may need to add more N to your fertilizer mix. These symptoms can also be caused by a PH imbalance.
It is worth mentioning that this symptom will also be seen late in flowering on many strains and is perfectly natural as the plant draws in nutrients from the leaves toward the end of its life. Some growers prefer to give extra nitrogen to slow or prevent this and others like to let nature take its course. Either will produce fine output.

from http://en.wikibooks.org/wiki/Marijuana_Cultivation/Common_Plant_Problems