mad farmer? new to me, but they do say they use different acids to control phosphorus lockout. never experianced it personally and i use a nice amount of ph down with water reaching 7.8-8 after sitting out over night.

sounds like a ph prob, u should fill out rustys form

i usually curl down when my ph is a lil hi like 6.9 -7 from 6.5 oh yeah disclaimer (this is not a diagnosis)