Any advice...?

Im growing a few plants in my first closet. Im growing in:
4x6 closet
4- 5gallon buckets centered in closet
Miracle grow potting mix
1- 250w 6700k CFL w/ reflector wing 3 inches above plants
8- 23w 6700k CFLs scattered around middle of plants within 1-2 inches
I have been watering only when the soil appears to need it (scared to over water)

i planted the seeds on Jan 26. directly in soil, and got 100% success, even though i only wanted 1 plant per pot i ended up with 8... all but one pot has 2 equal sized plants, the one has a very small plant (maybe 5 inches) and one very tall plant thats about 6 inches taller than the rest.

Should i clip the smaller one? its been growing atleast 4 week?

How often and how much should i be watering them?

And i have a couple of yellowish spots on the plants (see pics), any ideas what could be causing this and how i can treat it?

Any Advice would be greatly appreciated as this is my very first grow, i want it to be a successful one


Couldn't resize the pictures but i have a couple here
http://forum.grasscity.com/sick-plants-problems/564266-any-advice.html#post6962152
 
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