Round 2

Hi @Smokehonja yes, there is too much perlite but that will not be the cause. it seems to me that it was from the distilled vinegar, due to the acidic PH and if you sprayed it with the light on, the drops of any liquid you spray will have a magnifying glass effect and burn the leaves. Spraying should be done minutes before the light goes off or just after the light goes off. good luck mate 👍