hi guys im just in the flowering stage of my first grow my problem is i have four diffrent strains that are all doing well , they have been in flower four weeks now, im feeding them ionic bloom + boost + blacktreacle + dr hornbies big bud pushing ppm up to 1200 they are now under a 400hps on 12/12 temps about 80 with constant air extraction although they where under a 250w envirolight for the first 3 weeks of flowering and they where doing well but im just not shore how big they should be now ! and how will i know when to stop feeding and start flushing
any feedback please guys x