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That may have been what did your first set in, maybe introduced some infection and they had no layers to defend themselves with.

So you WANT your water to smell like chlorine? If its dosed right you generally wont smell it in those small concentrations. Not sure what kind of answer you are trying to get.

Yeah most LED's tell ya you need to get them used to that style of light at first, which means moving it far away for a couple days

I'd say your temps and ppm are doing a 1-2 punch on your plants. in DWC you really don't need that high of PPM in the system unless you already have monster plants.

Basically there are 1000 ways to skin this cat, pick one you want to try. Try it, then learn what worked what didn't and keep improving each grow.

And honestly if you look at @Heisengrow setup, I did the exact same system he has, just smaller. You find some of his root porn in this thread https://www.rollitup.org/t/diy-rdwc.972053/

75 is on the high side, I keep my chiller at 65 and it only needs to cycle a few times a hour to maintain that temp.

A chiller is there as peace of mind insurance. Keep in mind if your temps get too high you lose DO potential in the water.

Depends on how you run your system, I run a DIY undercurrent style system. So I have 2 inch bulkheads between 4 gallon square buckets, they tie in at one end where I pull water through an external pump which then hits the chiller, then back to the reservoir. I prefer the external pumps as they...

A main thing to keep in mind is that pump size, I run a 374 gallon for about the same size volume you are using. You do not want something that is pumping too hard because you need to give the chiller a chance to cool the water, if you are pumping into the chiller at a crazy rate it will never...