I used to run between 5.2-5.5, but after all this discussion on the Lucas reciepe,I have been doing a fair amount of reading lately.
it seems that running a Ph that low was why I always had to add Mg,either epsom or sweet
plus its very possable that running a low PPM was causing a problem also,so with this res. change I'm going to up the dose and the Ph to around 5.8-5.9,

I use clay pellets