Alright MG fam I'm in desperate need of some help with my DWC. More info in comments

What is the relative humidity in your grow area? Do you have ventilation & fresh air intake? Probably not the issue, but never hurts to ask.

When your plants were in veg did they have a fan blowing on them to simulate wind & strengthen the stems?

Personally I like PH to be 6.2, 5.75 might be just a hair too low, but I honestly doubt that's your problem.

They look really leggy, how close have you been keeping their light? Since you had them growing in a shared reservoir with so many other plants it looks like they were all stretching in an attempt to get more light because they were all blocking each other out.

Letting them share a reservoir and then separating them is never a good idea; not only because they have to compete for light but also because it would be nearly impossible that you separated these without damaging the roots. If root damage is the case (and I suspect it is) you'll want to trim off several of the largest leaves and possibly top the plants so your roots won't have so much vegetation to support while healing. I'd bet a nickel that trimming your plants back will help with the wilting.

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