Zen, that is some sort of micro deficit and it certainly can be caused by a ph lockout. I seriously doubt it is a tapwater problem unless your tap water is around 8 or 4 on the ph scale. I have read unless you have an extreme overabundance of chlorine in your water, it's actually helpful in low doses. I don't remember all the technical stuff about why. As a matter of fact and I'm sorry to say this, your girls look like they are exhibiting several different problems. I wish I could tell you more but plant disorders are my weak point.