I don't use anything like that in my tank. I just feed my tank frozen food, occasionally some flakes and once a week reef chili. My corals are doing great. I could see products like phyco pure messing with the water quality more than helping. It is easy to overdose.
Following, I just bought a bottle last weekend. I've only added it twice and about half the dosage. I'm willing to take a chance on this product. However, it would be nice to know if anyone else has used it longer and their thoughts/results.