I'll check that my no3 and po4 levels are pretty low at 0.5 and 0.08ppm respectively using D-D test kit. Could be my KH swing. Actually I only got two sps turning brown, one is german blue digtata and the other is the blue milepora which I heard is hard to maintain its color. I got a few questions, does this product, color elements need to be use in conjunction with FM balling light and pro sea salt in order to be effective? And if juz solely using this color elements, does this eliminate the use of dosing other trace elements as supplement? Hope to hear more advices. Thanks.