Don't know what happens with my Diesel (#2). ...

I'd say little over watering going on there, leafs hanging their tips down. Flush your soil with just plain ph'd water after it's dry. Then cut your nutes half. Better with lesser nutes than nutrient lock. Those leafs looks like nutrient lock yes.
Hope this will help! happy grows! :alien:

If your ph and all other conditions are good, i would say the light power is to low. But #1 is doing great so i dont think so. By the way you could go closer with the light and test it (you got nothing really to lose :sweat_smile: but keep the distance to #1 because she is doing good)

Ps: Check the ph of your outcoming drain, it looks like she got little nutrients lock out. (Deep green leafs from week 9 and it would explain the brown dots which looks like cal/mg deficit)