With regard to Marcus Tates' recent post. I have a suggestion to those of you using Aquasonic Fertilization Products (an Australian Product). I too use Daily Gro, and Basic Gro products, but I recommend that you use far more than what the instructions mention. Buy an Iron test kit to make sure, but I add 12 drops a day in my 250litre tank, instead of the recommended 5! Steve Amor n1036416 at student_fit.qut.edu.au