I used this link
So I have been dosing less then 5ppm for my tank size.
I must dose 2838mg for my tank to reach 5ppm.
One tablet contain 1000mg, thats means 3 tablets a day.
90 tablets a month.
Thats $42 for 5ppm per month, $82 for 10ppm per month....
markietan, I using Canon Pro 1, an old model prosumer camera plus photoshop.