Actually now that you mention it. After my first grow was almost done I bought a Hanna tds/ph combo meter and tested my nutes (mixed to Botanicares specified amounts/gal) and the ppm was way too high. I ended up with lots of root problems and very fluffy buds.
I have since switched to using vending machine style RO water and mixing @ approx. 3/4 strength nutes w/ 5ml/gal calmag. week 4 of flower and they look big and dense.