first signs of nute burn?

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Beginning of burn?

Gh 3 part in pro mix. Prob about 8 weeks vegged not sure inherited these as teens. Use RO water with cal mag. I feed with nutes twice then water. 15 gallon pots. I'm noticing the yellowing of the tips on the newest growth. Not too worried yet.

well, yeah, probably. you should flush them well and feed again.

consider using the lucas formula for the 3part.

Why they look like different height at all?!?How many MH u have???

Yeah sorry its confusing, because of what I was personally growing, and what i inherited from a friend everything is in a different growth stage. The plant I was concerned with is probably way over due to flower. The one in the lower right was a recent addition to my garden and I trimmed it down to almost nothing . And underneath are my small guys. I only have 1 1k MH in this 6x4 room. Its definitely not enough, but can't afford to upgrade right now. Still trying to get the cash together for my 4 1k HPS to start flowering half these guys.

In regards to the Lucas method...I'm still not convinced, though I was considering switching to dry nutes. I mean the idea of it seems kind of rediculous. It's a 2 part feeding recipe. Even GH offers multiple 2 part options, why not just use their 2 part solutions if you are trying to avoid using 3?

well, way i see it, it's not about trying to avoid anything (the lucas method also works with the 2 part flora nova i think), but just finding the good balance of nutrients that your plants will like. I know I kept having problems till i used it.

I dont know much about the nutrients youre using ....but it looks like the begenning of a chem burn....have you tried cutting the nutes to two thirds strenth