I started this grow a little over 3 weeks ago. I’m in coco/perlite mix (70/30) and using a 300w LED quantum board for lighting. 18/6 light cycle. I haven’t been watering until run off due to the plants still being fairly small, and I think that’s what my issue was (took a break from growing for awhile and making mistakes lol). Is this just salt build up? I already flushed it with Ph’d water just in case but I want confirmation from someone who might know better. Thanks for any help!
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Looks to me like they just got wet durning watering or was sitting in wet soil. 
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I’m seeing a little something on a couple tips down the edges of the same leaves, could be early signs of Calcium def. ?? Noted lightening on the same leaves too.