NOT NUTE BURN!!! don't wash...CalMag shortage......add a calmag product at like 5ml per gallon of feed AND drop the distilled water. If you have to use a bottled water use spring water,,,best yet use RO.. Distilling "damages" the water.....
Lower "starter" leaves die away naturally and that looks just that way, except for the calmag def.
recipe for success kit ,, That will work out ok,,,,just remember to feed one day then clear water the next and so on.
By the leaves it's throwing. I would start feeding NOW at 1/4 strength nutes w/calmag and increase to 1/2 in a week and increase by1/4 a week till full strength....
Those appear to be a nice Indica and they tend to be quite tolerant of feeding. So get going and.....
Good luck!