Hi. I got ambitious for a first grow and went for a couple of oxypot 4's in an 8 X 4 tent. I'm a couple of weeks in and I've had a couple of issues. I was using a 75/25 RO/Tap mix. I fucked up with my ppm and nutrients and basically ended up with a ppm of around a 1000. PH is good. Over the last few days, I've started getting burning on the tips and sides of leaves. One in particular, quite badly, stunted growth, will replace, and 1 I'm not sure about but I would like to keep it as its one of 2 critical orange punch auto. I've also got 6 Hulkberry autos in the tanks plus I've got 3 Northern lights auto in coco fabric, and I've got a skunk of unknown origin that I'm vegging in order to try and get some clones for the next run.

I'm running a couple of phlizon 2000w cree cobs at 24 inches, real draw 450w.
Plus I've got a couple of 50 w Amazon's over the coco. I'm worried I'm a bit under powered so I've got a 200w citizen dual cob 3500k that has arrived but is stuck in customs. We're locked down here so who knows when the light will arrive.

I just changed the water to pure RO and havent added any nutes. ppm is 006.

Was thinking I'd leave them in the pure water for 24 hours to give them a bit of a flush before I add nutes again.

Any advice gratefully accepted