hello again i don't know if will help u,but i notice the problem is more on the older fan leaves..i've look through some pics and it favors a Magnesium problem. i use 25ml per 5g of cal-mag... if it's a mag problem how do i go about fixing it? i have some epsonsalt and some lime i just don't know how much to use or what way to use it.. any advise would really help.. thanks