need a lil help (pics inside)

well i had this post https://www.rollitup.org/marijuana-plant-problems/559413-whats-going-guys-all-well.html
took all the advice and well the blueberry diesel is doing better but the sour cream is not and now my 2 blue dreams are also having the same problem?? added cal mag put a tiny bit of supersoil on bottom of pots along with roots organic and have just been giving them fresh water ph'ed at 6.5. could this be a problem with my tap water? any help is highly appreciated

first is of sourcream 2nd is from blue dream as is 3rd then the 4th is just what the leaves look like up close before going totally yellow and dieing off

Usually when the leaf yellows from the back to the front with burnt tips it's sulfur deficiency and a couple leaves show nute lockout mainly the first picture on the leaf to the left.Epsom salt cures everything lol

Forgot to add it could be your soil PH anything under 6.0 locks out sulfur

good lookin ill try epsom also these plants are 3 months old my younger plants have zero problems so im starting to think its my tap water having to much ish in it causing stuff to build in my soil and lock out things but not to sure just been reading but thanks ill try some epsom