First Time Grower with First Problem

Hey guys! Great website i have been floating around here for awhile and finally started my first grow. All of the plants are currently in one gallon pots with a mix of fox farms ocean forest and fox farms light warrior. Im using a 600w HPS with a quantum ballast dimmed to 75%. The plants are watered with RO water the PH test to 7.5 The temps in the room range from 75 to 81 and humidity is hovering in the 40's

I recently noticed that some of the plant edges are curling down on some of the plants, after reading on here i figured this is from my lack if knowledge on how to properly water the plants, im guessing that I gave them just a little to much water. But some of the other plants have this odd look on the leaves, it is a darker green on the tips and the leaves have a odd wave shape going on here are some pictures of the of leaves. It is only accuring on a White Widow and one of two White Dwarfs.

First Picture of What Im Talking about


Another Picture


One More


Also on the white Dwarf at the tip of the new growth it has turned yellow


Here is a picture of My pure gold I fed it a low dose of nutrients a few days ago and a few days later the leaves began to cup and i began to get spots on my lower leaves, my guess is im a fucking idiot for giving it nutes so early and i burned it


Another


And here is on of my power skunks other two look good the leaf tips are starting to roll down, but again i think its beacause I didnt let the soil get dry enough.



Another


Thanks guys hope Im atleast on the right track with whats wrong with them! I really thank you for the help!

just a quick Q: Are you feeding any Nutes to the plants (any) and What type of water you using?

Looks a little like over watering and a bit of Nute burn.


EDIT: Re-read and say u mentioned you added Nutes. No big deal, just flush them once it may not like the water extras but it will thank you in the end.

Yeah the pure gold is the only on the got fed nutes, a very light dose of Humboldt Nutrients, and all my water is RO with a ppm around 8 and ph is 7.5ish. I figured thats what it was so for the overwatering do I just let them dry out from now on or is there any special "step" to correct the problem.