what strain are you growing ?
1/2 of my garden is fussy ass blueberry and they're puttin up w/ 900 ppm easy . i usually don't like going much over 1200 ppm . atleast so far . 3-4 hydro grows under my belt . i'm still learning lil bits n peaces tho . look at bluebears thread on waterfarms / bubblers for help also . so far bluebear , weedhound , and a cpl. others have been the voices behind my questions answers . got lotsa experience w/ my head in the dirt =like 15 yrs. worth , but i'm hooked on hydro now . way way fast , n relatively easy .
peace
crispi