One plant not growing

So I have three plants, two of them are doing great they growing colors good. One of the plants does not seem to be growing but the color is getting to be a really dark green, way darker then the other two. They all have the same lighting, watering everything. Is this plant ok?

Overdose of nitrogen. Cut back on the nitrogen fertilizer on this plant and let it use the excess it has stored up-- the leaves will go back to normal.

I haven't used fertilizer.

Some pics might help us help you ...

Are they clones or from seed? What kind of soil?

They are from seeds. It was soil that my grandpa uses for his garden im not exactly sure what is in it. I will get some pictures.

The nutes in the gardening soil is most likely it- you've prolly got one plant a little more sensitive to nutes than the rest.

You can't see the nutrient content of your soil, either nute balls are in the soil or perlite- for your peace of mind, I hope it's just perlite. =)

im pretty sure it is perlite. i dont think he put nutrients in it.

ok here are some pics. The middle one is the one i am conserned about. It looks ok but it is smaller and darker then the other two. I can see changes in the other two but not the one.

sorry it is not the middle one it is the third one.

They all look fine. Not all plants grow the same speed. Even all the same strain. I wouldn't kill it at this stage. it may out perform other plants in the future.

I wasn't going to kill it. I was kinda thinking the same thing, but it is better to know if it is ok rather then just think nothing of it and it turns out something is wrong.

They look fine. Standing, and not reach too much, i say let them go. Good luck with the grow.

Didn't know they were only seedlings...

They're fine... lol.. first rule.. don't over analyze the grow.. or you'll be pulling out your hair by the 3rd week...lol