First time grower.

I've been on here a lot, but never posted.....

We have 9 beautiful babies, almost 6 months old. They are under a 3-bulb LED (blue) (I know, many people have told us these lights suck, BUT we have been very happy with them & growth has been great) & have been 24 hour this whole time (we were planning on changing to 12-12 this wekend, BUT....).

They were absolutely beautiful & healthy & thriving ...until a few days ago.

Nothing changed in the environment, we water them regularly, there is great ventilation & air, warm enough....

One of the tallest started wilting down from the top down, we watered it, it worsened, so we cut the top 1/2 off (!) & it still completely died & wilted down.

We fed them liqiuid fertizlizer & watered them thouroughly...

Today the leaves are yellowing, there are brown & yellow spots, which when worsened start to become HOLES through the leaves!!

Please help, I have posted the best pics I can. There doesn't seem to be any sign of bugs, a few knats were in the soil but not anymore & 2-3 at most...
A friend said it looks like a fungus or from the knats (which I didn't think could make such a huge impact on more than 4 plants!). I know yellow is from over watering, but i also know I haven't over watered...

Not sure what to do & would hate for them to all die when we have been working on them for 6 months.....THANKS FOR YOUR HELP!!!!!!!!!!

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HollandHemp Reviewed by HollandHemp on . Plants dying all of a sudden...I hope they can be saved (6 mos. old) First time grower. I've been on here a lot, but never posted..... We have 9 beautiful babies, almost 6 months old. They are under a 3-bulb LED (blue) (I know, many people have told us these lights suck, BUT we have been very happy with them & growth has been great) & have been 24 hour this whole time (we were planning on changing to 12-12 this wekend, BUT....). They were absolutely beautiful & healthy & thriving :D...until a few days ago. :( Nothing changed in the environment, we Rating: 5