over nuted

i had some 3wk old babies that started off potted in flower power from a cube then recently i put them in 5gl's with ocean spray fert. the pakg says that they are good for 3wks of watering with no nutes i read this at least 3 times all these 3's but for some odd reason i decided to give them 3caps per gallon of water of fox farm grow big this is a soil plant. now surprise i am gettin brown spot and burnt leaves i just went out today and got the ph tester for my water because i wast told that the tap water is also high in ph i did a test on that and i came back witha ph of 8 i added ph down and couldn't measure it exactly the end result was a ph level of 4 which i figured would be better then nothing.. i leached all pots twice both times with 5gls of ph level 4 water all plants are diff strains and are showeing signs different. middle leaves are yellowish but still green but have brown dots the worst of once has a faded sight of these spots on it's main stem.. my runoff from this procedure was also a 4 what can i do?

If for some reason you don't want me helping you, just say so. Otherwise,
you can start by answering the questions I asked you on your other thread that you started for these same questions.

I've answered this posted on your other thread.