if they are in 2 liter bottles, no.
i didn't catch this in the thread, but you have the lights on for 18 hours of the day, correct? when you are ready to flower, you will switch them to 12hrs on, 12 hrs complete and utter darkness.
smell is going to be an issue for you, you can't do anything with febreeze, i tried buddy. i had to go and get this thing called ONA (odor neutralizing agent) and something called "soilmoist"... both i got at a growing store and i stuck it in a milk jug with water, cut holes and whatnot, and BAM no smell whatsoever. you can't febreeze your plants and the smell is coming directly from them not sticking to fabric.
LOL coffee doesn't work, that trick is for concealing crack, hehe.
vegging should take place until your plants are producing leaves that have at least seven fingers on them, and when your plants have at least 4 or 5 nodes; once they're about 12 inches tall, and nice and healthy and not stringy lookin, change the lighting. they really will almost double if not more in size during flowering so keep 'em short if you're doing stealth grow.
another VITAL thing; what type of water are you using to water your plants, and what is the pH of that water... these damn ganja plants are SOOO particular about the pH of water, so let me know what you're using, as that can be causing the yellowing of your leaves.
the color of the stem will change to green once the stem thickens and matures, you need to get a fan in there not only for heating but for strengthening those stems, it really really works.
a word of caution, i had a very bad experience with miracle grow, and i transplanted into FOXFARM soil, basically the #1 recommended soil on this forum... i totallly love the soil, mixed with perlite to make it fluffier.
I went through all the questions with ppl on here, and i'm sure you have alot more. Message me if you want any advice/help, I'll be glad to help you prevent my previous mistakes.