You didn't mention what you were using or if you or if you had a cal deficiency. So if you are using a base nute and also notice your having a cal deficiency then ya you may want to add that to your already existing line of nutrients or depending on what base your using you may just want to up the base.
Lots of farmers add cal mag to there line of nutes when they run a strain that requires a lot of cal.
Yeah I'm new to hydro but i think you want your ppm around 150... so if it comes out of the tap at 30 like mine you want to add Cal mag till is closer to that number, same with ro or whatever. ... double check but i think that's what cs reccomends