Im puzzled too weedhound - but I did just increase nute strength to 1250 ppm from 1000 ppm (in 4th week flowering) and my pH is dropping from 5.8 to 5.4 during the course of the day....I'm somewhat baffled. Plants look fine so I don't think it's too strong....guess I'll just keep an eye on it.

:jointsmile: