Getting the balance right without a meter? DEFICENT or BURNING!!

Home-made Hydro system, DWC TEK....600 watt MH conversion. PH steady @ 6.1
Temp 76 F. Using FoxFarm grow big. These babies under ferted or burning? I looked at the other pics, these look different though!

Ok , After desperately researching on the web, it's my opinion these puppies exhibit the symptoms of overfertilisation. I drained the tub, added fresh H20 , Leveled the Ph and thats about it. Now what? wait a few days and see what happens? Hopefully it was an adequate solution, don't mind paying my dues.

all you can do is wait 3-5 days