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Nice looking, should lower light as close as possible to eliminate stretch, keep up the good work.

Tho I'm not a DWC grower, I do do flood to drain, and my ph always ends up higher after a few feedings, to me that's normal, I just re-adjust before next feeding, not sure but think you should strive for a ph of 5.8.

Most have answered your question, you're not giving you seedlings enough light, lower the light as close as possible without burning them, personally I never spray my seddlings or plants, remove the dome, they need to breath and make sure there is constant air circulation with a small fan for...

Ideally you should be using glass jars, as most have said plastic is not a good choice for curing, I use mason jars with the small boveda packs and it works great.

It'll be very difficult for any of us to help without pics, so many things could be the reason, and trying to explain the problem will not be easy, why can't you post pics? It might help if you give us more info, medium, lights, nutes, are you checking your ph?

I agree with WhiteRooster, a TDS meter is the best means of keeping track of the strength of your nutes, that's the only way I do it.

As far as how high above the plant for T5, I usually try to stay 3 to 4 inches, seems to work ok, they tend to grow fast so you have to keep an eye on them.

T5 fluorescent lighting would be your best choice, low on heat and elect, naturally as the plant gets taller, the lower branches will suffer a bit so it's best to start bending (tie) them down, pick a plant that grows short such as indicas or hybrids, lighting is best at 18 hrs for veg, 12 hrs...

Tyrantecks: "What is a PPM meter?" PPM meter or known as TDS meter measures the amount of desolved solids in your solution (parts per millium) it basically tells you the strength of you solution, PH measures wether your solution is too acidick or akaline, they are two different things.

For best results you should keep track of your ph 5.8 for hydro, also you need to know the ppm's of your nutes, that's important, you don't want to burn them or underfeed them, the suggested mix given by manufacturers tends to be too high in my book, thus the need for a tds (ppm) meter, lighting...

Do you know what strain they are?, were they from seeds or clones?

They look nice and healthy to me, a bit stretched but look fine.

As for the first question, yes, I always check my ph before re using my nutrients after drain, as far as ppm's I only check when first mix nutrients, re use 2 sometimes 3 times but never check ppm's, I've yet to see any problems from not checking ppm's begore re use.

Mine drops to 60 degrees, maybe lower with no problems, they are healthy and show no signs of stress.

Really can't answer that, it's been many yrs since I've used MH and HPS, and I do mean many yrs, sorry.

I do it all the time and never had any problems.

You're in hydro and you're not feeding any nutes? just water? I'd say your plants are hungry, feed them.

I would think that should be ok, yes you should switch lamps for bloom, 6500k for veg and 2700k or 3000k for flowering, I've been using T5's for a number of yrs now and have decent grows, yes the yield will be less than with MH and HPS, but as I said, decent.

I would think that should be ok, yes you should switch lamps for bloom, 6500k for veg and 2700k or 3000k for flowering, I've been using T5's for a number of yrs now and have decent grows, yes the yield will be less than with MH and HPS, but as I said, decent.

Hard to tell with the colored led lights (I'm assuming), next time take pics in natural light, it will help with diagnosing, ...sorry.