Black spots and tips on Cymbidiums

[garlicbeth@comcast.net]

I grow cymbidiums and have a problem w tip black spot in a triangle, on the leaf blade, and down in the crown. Unsightly and I do not know how to stop it. I use Neem in the winter as spray it seems to help but in the summer they are outside and it gets worse. Any thoughts, suggestions chemical, etc. the forums seem to say mineral burn. I do have hard water, use well water and rain water. Lots of iron in the water. It spreads so I thinks it may be a fungus, but a grower told me bacterial.
Thank you, beth

As you can see the little one was bought in the spring with some spot, it has gotten worse outside (40 m west of Chicago), in part shade, most shade. I water 2-3 x a week with well water. From my reading it sounds like too much mineral in the water and not enough watering? The big one I thru out bc it has so much leaf spot I’ll never get rid of it. I have been able to control it with my brown cymbidiums with neem oil. What do you all think? Thanks for your help. Just found the forum.