Cal-mag = calcium nitrate + magnesium nitrate
The reason it greens things up is because of all the nitrate.
Look at your nutrient bottles. One of them is going to be calcium nitrate. Use that as your calcium source.
Substitute magnesium sulfate, aka epsom salt, for the Cal-mag. The bonus is sulfate which really helps with resin, terpenes and aroma.
I use dry nutrient salts like greenhouse professionals because it's cheaper and I know exactly what I'm getting. The sexy labeled water bottle sellers are awfully coy about what's in their mixes because there's almost always a bunch of shit you don't need, emulsifiers, preservatives and often hormones and PGRs.
I use a mix from
www.hydro-gardens.com that's 5-11-26 plus micros. It's designed to be used in conjunction with calcium nitrate- 50lb bags of which cost me less than $30, just to give you an idea of how much dry nutrients can save you. They also make a 4-20-36 plus micros mix that's very popular with dispensaries in Colorado. The ratios for that are different.
The ratio I use is basically 3 parts mix, 2 parts CaNi and 1 part epsom salt, by weight. I mix the calcium nitrate separately and add each to the reservoir already partially full so as to avoid high local concentrations of salts reacting with one another.
I use this same mix in veg and in bloom. It's cheap enough to just dump and refill with fresh solution on a regular basis.
The order of progression is to add the dissolved nutrients to a partially full reservoir, dilute to desired solution strength and adjust pH last.