Im having some issues with ph-levels. I flushed my perlite at the before the grow with ph adjusted water, but it clearly wasnt enough. Ph-level rose couple of times over 7 Now it seems its starting to settle.
One of the plants got some splashes of nutrient solution to its leaves before I changed its position. It got some nasty burns. Also couple of the plants have really purple stems. Probably caused by the ph changes??? The oldest plant has a clear green stem. They are still growing, but I am little worried.

Heres some pics.