Are you watering with low ph due to high runoff, otherwise thats the problem your ph should be 6.8 in ffof @ErnieX I know I told you half strength, it may be time to increase. This I do need to tag garrigan62 for though.
@garrigan62 how is the white widow with cal mag uptake does it take more than usual or less than usual, or same amount as most plants
pH watering low because didn’t think the roots had gotten into the FFHF yet from the seedless medium. Will wait for instructions.
Ok will has you in great hands I gotta take off im sorry buddy if I had more time id help
Hey, no sweat, appreciate the help.
For the few next watering, PH’d your water at 7 , until your runoff as reach between 6.5 and 6.8. Let your soil dry too, you overwatering a little, wait until 1 inch in the top soil is dry, ok @ErnieX 
The disponibility of calcium and magnesium are at PH between 6.5 and 7 in soil for plants.
And a ppm reading with a TDS meter will help too.
Hoping that’s helping you a little 
~Al 
No, not at each watering, otherwise you gone a have build up of cal mag and cause other problems , just 1 of 2 watering (feed water water etc.)
And you’re welcome @ErnieX, it’s always a pleasure to help a fellow grower
~Al