Hi, In the comments i will let you alink for growing in Coco coir. Picture nr3 looks to me as if you have spilled some solution onto the leaves. And yes I agree the other Picture looks like having troubles with the PH. And just one hint.. your coc never should run dry, all the other recommondations you can read on the site. Up to now no big damage is done. Just follow the tutorial on the site ... greetings