Hydro: Some plants like it, some don't...

[Greyskull]

well I have had similiar issues with the leaf edges turning up like that.
First time I saw that I thought "sure looks like praying for magnesium".
I started adding 5ml/g Cal/Mag andit corrected the issue; I have since backed it down to 2.5ml/g for the past 6mos and no more praying from my leaves.

Good luck.

 

[moonymonkey]

loos lik watering is off,an sometimes afects ph too...one thing it really afects is the calcium availability,look on the side ofthe leaf blades curled on edges,classic example...this is not heat stress....peace moon/

 

[moonymonkey]

polyurathane slabs hold lik aroung 75% air,not lik rockwool which holds aroung 75% water...big difference...peace

 

[kenned]

just wanted to show..
That one leaf didn't get any better, but this is how it looks today..

Old leaf:

Today..

Have fun and a merry christmas