my leaf tips are browning!! i need help anyone please, PICS!!

so i go into the grow room today and notice browning on two large fan leaves, as i look around i found a few more leafs starting to do the same thing
before watering recently this plant had ZERO discoloration,
anyways i think it might be PH related because the ph of my water is pretty messed up
i am definately not overfeeding; if anything i would be underfeeding but no signs of that
what im worried about is trying to fix the PH problem, i never did alter the ph before waterings because i thought that was what the dolomite lime was for but its not doing its job or something
i just watered 2 days ago and its only getting worse what do you reccomend i water again with corrected PH or i leave it, i dont want to overwater but at the same time i dont want this PH problem to get worse

The plants look fine. If you had a 'problem' in your soil or with your feedings, it would affect more than just one set of leaves. Your overall plant health looks good so I wouldn't worry about anything. If you try to correct this 'issue' and flush or add cal/mag or whatever other suggestions people around here would give, you could harm the plant and actually cause issues trying to fix this 'issue'. Relax and keep up the good work .

wow thanks i get scared seing these things though, as before this the plants were PERFECT color, and not one abnormal leaf or anytthing; to have stuff start to go wrong now is SO depressing to see as i have done so good this far; if the leafs do continue to do this though; would you reccomend i flush with a PH corrected solution and re-water with nutes?

Your first pic looks like rust mold. If the brown spots have a rough looking texture with raised bumps then it's rust mold. You can use something like Eagle 20 to get rid of it if that is indeed the problem. Eagle 20 is hands down the best fungicide on the market. It works on everything and is systemic so it stays with your plant and you don't have to keep reapplying it. Good luck