Budbox BioBizz GrapeGusher

so after putting biobizz feeds into my water solution my ph droped from 7.5 down to 6.48 which is optimal for me so no ph nuits needed however i feel i may of over fed her at one point as there are some discolouration (rust patches) so think maybe a cal or over fed deficiancy but she seems to of bounced back at the end of week 3 she has been topped on her main stem for x2 cola effect but have also topped some lower branches and mainlining for top colas on all a little defol to allow for light penetration and to add further to the stress i have lst her too also fyi the PPM & PH levels are all done from run off so my substrate ph and ppm are (6.48 and 212) pre pour they are 6.56 and 596