Nute burn or deficiency

I have a pre 98 Bubba kush that is in its 7th week of flower. The leaves are turning brown and shriveling up. It is affecting the fan leaves primarily. Any ideas what it could be?
Hempy bucket, 4:1 perlite:vermiculite, using botanicare pure blend pro bloom, along with hydroguard. I am also using tap water, which starts at 500+ ppm, not ideal I know, but all I can manage right now. Any help would be appreciated.

Ya that's nute burn but the good news is its early stage and the plants are old enough to overcome it. It's not your tap water it may be the soil, what are you feeding it?

Hempy in 4:1 perlite:vermiculite, using botanicare pure blend pro bloom and hydroguard

Calikron said:

Hempy in 4:1 perlite:vermiculite, using botanicare pure blend pro bloom and hydroguard

Click to expand...

Sorry bro ya lay off the nutes reduce to half strength for awhile.

that's almost finished. I wouldn't give any more fert.

So just start flushing? First grow, so I'm just trying to figure everything out

@Calikron yea i would go straight water, from here out. make sure u cut off any dead/necro leaf spots. don't want rot/mold. if this is ur first grow then congratz on not chopping to early.

Cool, I appreciate everyone's responses.