Cal-mag issue?

i think that's what the pic I'm adding is showing. I'm at 6 weeks of veg, and about 5 days ago I noticed this. I'm 3 weeks into flowering with the fox farm trio. And didn't know until last week that this trio affects the plants when it comes to cal-mag. I dosed all of my plants with lime this morning. Anyone think that it could be something else??? This is my second grow. I was using distilled water until now but have just today switched to ph'd tap water

I'm 5 weeks into veg. It's a northern lights strain that I topped so that would explain the size. I think I've deduced it to a nitrogen deficieny. I just have the second dose of my more nitrogen heavy nute and I'm hoping that helps.

looks to me ur starting to get nute burn , very tips starting to burn up there.