Deficency problem?

Nordic division

Active Member
Hi,
i was wondering could anyone tell me what kind of deficency am i having.
Plants are 3 week in flowering and it seems to me like potassium could anyone confirm or tell me whats wrong and how to fix it?
In the beginning i fed them with rain water and everything was ok but when i started feeding them with tap water could it change my ph levels in soil?
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