They are very stunted for their age..they should be much bigger.They don’t show any over feeding signs , and I’m not feeding that much, like I said my tap water has like 250-300 ppm itself . I watered 2x more then I usually do today, tomorrow I give all of them 1L water. We see. They drown they drown. Nothings can be done
You're growing in coco, it's basically hydroponics..at this stage especially you can't overwater.
I'd say the coco is more than likely packed full of nutes now though (because of the 700PPM's you've been giving), so if it was me, I'd give them a real good watering on the lower PPMs to make sure they don't burn now with the increased watering.