5th week flower curling yellow edges

Hi guys first time poster over the past week my leaves are curling up ward and yellow/dark edges sometimes a few rusty spots would this be nute burn? My ecs are around 1.8, ph around 6.0 I'm running Dwc under leds maybe 1.5 feet above canopy.Using canna aqua,a booster,silica ,i have flushed with just phed water for the past few days seems to have helped (I think), the lower canopy doesn't seem to be as bad.i have defoliated most of the bad ones as there where alot more. Apologies on my shitty wording.

It's been a few hours since you posted and got no answers so I'll put in my 2 cents worth.

Your plants look almost exactly like mine. I know that mine got a little too hot. I didn't worry too much about it. It was mostly the bigger fan leafs. The sugar leafs had just a touch of it.

One reason why I'm posting this is to keep your thread up towards the front so it will be seen.

Much appreciated mate, Ill double check my temps recently changed to a new 420w led so I'll try and bend them over a little more and see how I go, thanks again.

Another for heat. Slight burnt tips but no major worries she's eating good and will make a strong finish