Bill--the lightbulb just came on for me as to why green clean and phycomycin get different responses and results for people that use them. In the situation for trout, green clean is for surface matts and phyco for deep algae. Thank you.

FWIW HL, when I spread the Phyco out (it's granular), I can see it settle down thru the water ONTO the algae, where its in direct contact to do its thing. If it was liquid, it would be diluted by that point.