i would take them off as they die. basically pull on the real yellow necrotic leaves very slightly and if they are ready to come off they will. ALSO remove any small flowering sites...this will increase top weight and overall yield as those areas won't gain much weight anyways. Also just plain...
I would say distilled as you can be sure there are no trace elements like in spring water. But then again I heard it does not keep its ph. I prefer tap water...let it sit for 24hrs...shake it...and check the ph. The water is at a 6.0 ph since the soil is MG (YEAH I KNOW!! No need to remind me...
also check the PH levels and make sure that they are at it is between 5.9 - 6.3 that could be the cause of the yellowing in the right fan leaves and the burn on the lower leaves - nute burn...good luck...
as long as it does not spread throughout the rest of it your cool... lay off the nutes for an extra day and see how it reacts...IMO...other then that looks bad ass!!Keep it up I amTuned in!:weed: