Is this a calcium def?

Killer answer waira...it's only on one plant.
I'm also using tap water, think it's comes out at 7.2 -7.6.

So water quality report says slightly hard.
my ec is between 0.2 and 0.4 so probably 0.3, I have a blue lab truncheon so not a million percent accurate but good enough...ppm depends on the range ppm 500 or ppm 700
There both in the range of 100-200 and 140-280 respectively

I'll chuck up a pic of offending plant later when I'm home, thanks for the help man
 

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Pics of offending plant, only a few of leaves at the top of the plant are affected
 

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