Slow-down and pay attention to what you are doing. Accidents happen, but usually not all in one grow.

Put them on a 'normal' feeding and watering schedule asap and keep them there. Ingoing water for cannabis in soil should be between 6.3 and 6.8 ph. For feedings, I set my water to 6.8 or 6.9ish, then add nutrients. Brings my water down to about 6.3ish.
Quit flushing. (overwatering)
Plant some fresh seeds now, just in case. (plan ahead)

If you do not have calibrating solution, I'd get one of those freshwater aquarium ph test kits ($7.00 or so) and cross-check your tapwater ph. (without nutrients) If the ph pen and the test kit agree, then the pen is close enough for cannabis. Do not let the probe on the ph pen dry-out, as this kills it's accuracy.
Adding more crap to the mix can compound your problems. I have never had a problem with using plain, properly ph'd water for flushes.
Clearex is one of those cool-sounding, but totally unnecessary products. Contains as it's active ingredients, glucose and sucrose. (sugar and more sugar) My guess is that the remaining 97% of the ingredients is water.