green cross is correct, however, this is also due to lack of curing and due to moisture in the bud, and the reason for the ''crackle'' is most of the time because of high nitrogen late in flower ( when you dont need it ) i stop feeding nitogen at week 3-4 flower and i have NEVER had crackly buds, only shit that tastes like heaven and gets you high in one hit everytime. i personally find flushing useless, just another time i have to empty my res and balance my ph, waste of time to me, but to each his own im sure someone will still call my buds worse and nastier tasting than theirs because they flush for 2 weeks without even tasting or looking at any of the weed ive ever grown but dang thats the internet world, where everyone knows it all and google is the most creditable source.