Yeah pH is a bit whack...not by loads, but it def would be the problem. A mild lock-out maybe? But then that is pH problems...I unfortunately can't afford a pH pen at the moment, although that's what I need. Just litmus paper at the moment - which only gives ranges and not intricacies. pH + and - I hear is good to buy...
Any handy tips (without expenditure - at present) for sorting out pH? I know your a Hydro guy Dime, so it mightn't apply! I dunno...and yeah - I feckin hope they're far from dead!