alright, i have four young seedlings. three of them are a little over three weeks old, and the other is a little over two weeks old. just yesterday i noticed a slight discoloration of the leaf tip of Plant B (three weeks old). At the end of the day, i checked on my plants, and the tip of its leaf had turned a pale yellow color, and was dried and had cracked. then this morning i looked at my plants before work, and Plant A (two weeks old) was beginning to show the same discoloration of the very tips of the leaves that Plant B had showed in the beginning. Plant A (two weeks old) and Plant B (three weeks old) are my smallest plants. Plant C and Plant D are much bigger than them, and i'm thinking that something is up that is causing a stunted/slower growth in A and B. My Specs: -Each plant is in its own 8" pot in Miracle Gro Potting Mix -My lamp has two 40 watt full spectrum verilux bulbs - 2100 lumens each -My lighting cycle is 17/7, and a fan blows on low setting in the general direction of the plants to keep the air moving during the 17 lighting hours. -I water each plant with about 5 ounces of distilled water every three days, and i do not mist them -I don't know the ph of my soil or anything, i haven't bought a ph meter yet... but i plan to at the end of this week. -I don't use any nutes as of now. -The temperature is always between 63-70 degrees fahrenheit -The humidity is controlled by the thermostat, and is around 35% FYI: All four of my plants used to be about 6-7 inches tall and very leggy, but i repotted and buried them down to about 1" from the first set of true leaves, and that's also when i bought the new lamp and moved it to about 1" away from their leaves. Since then, they have grown a lot. So my question is this: What can i do about this strange yellowing of the leaves? Is it a lack of nitrogen? Light-burn? Poor drainage? Should i mist my plants? I hate to see my poor little plants suffer. Thanks in advance everyone P.S. i know what you're gonna say - i should have searched the forums before posting such a popular question. but i looked for like 20 minutes and i didn't find anything that really answered my question.