some indica's can take up to 2000 ppm in like the 4th or 5th week of flower but i would recommend u to never go over 1800ppms.. oyea and not all meters read ppms the same, some will say 1800 some will say 2000 and another one might say 1700..u calibrate your own meters and some are made in different countries..and countries read ppms and ec differently.