It's always very important to control the pH of the water .....knowing the ranges in which nutrients are absorbable, for both growth and flowering....
I hope to be of help
If you have a pH tester you not only can but should do that.
In soil the optimum range is from 6 - 6.5 ph and in coco 5.5 - 5.8, I´m not sure about hydro stuff tho.
Hope I´ve helped.
Peace ✌️