You can do whatever you want. You just won't get shit for bud with those lights. Try to flush the fert out of the miracle grow soil. These plants will likley suck there whole lives so grow them out till you can take a clone or two. Look at someones cloning thread to learn that. Then start...
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Those lights will be good to veg, but you need a lot more light to flower.
What soil or medium did you use? You could have used a medium that has a dose of fert in it already and not thought about it. That would account for the dead first leaves.
You will want to get them used to nutes...