To calibrate your meter you need calibration solutions at 7.0 and 4.0. The meter will not work on R/O or distilled water
You’ve got fungus gnats? Those are usually caused by a very wet soil that’s not being allowed to dry out.
Ok I will get some solutions to calibrate it and yes. For sure gnats. I did over water a few weeks ago too so makes sense. I guess I best get some treatment.
Overwatering has been the issue from the get go… which is leading to a bad ph issue … that is leading to a nutrient lockout… it’s a snowball effect… 
First things first… stop overwatering… second… get the proper tools to monitor everything… ph , Ppm , environment and anything else that you can monitor…
Once you have these things fill out a support ticket asap and we should be able to get you back on track…
Also get a good magnifying glass and look for bugs… you have made the plants weak and now a bug issue will be your next battle…
I wouldn’t scrap anything just yet… I’ve had plants look way worse and brought them back to life to flourish…
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cut a few strips from a roll of fly paper and lay it on top of the soil, it will not cure the gnat problem but you will see evidence of their demise…which is cool 