Trying to determine deficiency and how to correct pls help

Hello all haven’t posted for awhile hope everyone is healthy. Need help identifying what type of deficiency I’m dealing with and how to correct grow has been perfect until switching to flower and now getting spots on leaves growing in autopots using advanced nutrients sensi,distilled water, temps have been in 80’s any help/advise on how to correct would be much appreciated

I’m sure its calcium deficiency so I turned off the res of autopot and hand feed 1gal of distilled /w 8ml of sensi cal will see if this corrects it