appears to be early stages of Magnesium deficiency. Flush the plant to make sure nothing is building up that may have caused a lock-out, then add a little cal/mag (botanicare) to your nutes. somewhere between 2-5 ml/gallon
However, they are young. maybe too soon to tell, so dont jump the gun based on my advice, BUT if it does turn out to be a mag def, then take my advice, lol. Either way, FLUSH with plain de-chlorinated water
appears to be early stages of Magnesium deficiency. Flush the plant to make sure nothing is building up that may have caused a lock-out, then add a little cal/mag (botanicare) to your nutes. somewhere between 2-5 ml/gallon
There you go. The others will follow suit they are just handling it better atm. Put them back under the small light till recovery then put the mh in started up higher if you can keep temps under 80. If you don't they wont recover, heat stress is damaging and sometimes they don't recover.