6 new clones sharing water, 2 looking very sad

I got these 6 clones on saturday, and at the moment they are all sharing the same water. 4 of these are looking great and just right on track, but the other two are both showing different symptoms. The mango (larger of the 2 in pics) looks to me to be over watered even though my airstones are directly under each plants root system. This was also the only one that came in a root plug instead of rockwool and seems to retain water much faster which would make sense, but im not sure to help that out until the roots actually get out of the net pot and into the water so i can lower, or i don't know. The smaller of the two in the pics is one of my hash plant and it seems to be showing just about every sign of deficiency so i top fed just that plant a little over the last 2 days with nut water at 600 ppm (pH is 5.8 if you're curious, in top fed water and res.) and its still not getting better. since they are still so young i dont want to burn them with strong nutes.

Setup:
2- 10 gal. res
6 - plants
600w mh conv.
8 - 6" airstones
3 pumps total
GH flora system


Thank you all in advance for any strong wisdom!!!

if anyone is reading this at all, they are still looking the same, nt getting worse but not really getting any better. any help out there for someone new to RIU?

600ppm could be too high for that strain. Is the ppm rising over time or staying steady? If they are over watered, you need to pump more oxygen into your nutrient solution.

i thought it was over watering at first but i realized the opposite, that one plant hasnt dropped roots yet into the rez, and is sucking up everything way too fast. i've been top feeding it like 4 times a day(its dry everytime) and i think its looking a little better, also trimmed some leaves so it could focus energy on roots (very tight internode spacing on mango) also that strain even though rots havent dropped has like 30 roots sticing out of plug they are just short, whereas my other plants have like 5-8 roots that are over 6 inches long. i only went with a higher ppm for the top feeding to combat deficiency, the rez is at around 350 ppm. just started adding some microbe brew as well in hopes to get those mango roots into the water. and my ppms and ph both stay very very steady for me, they hardly change even after a week