This stuff is stubborn. It is easy, easy to kill with a 3-8 ml Excel syringe direct shot. I thought I had killed it all. Another little tuft shows up in substrate elsewhere. I killed That. Now I see it in my healthy baby dwarf Hairgrass. ARRGH!. I like the 50 Amanos cavalry idea, except for the high cost of ~ $150 bucks. And many of those shrimp would end up being an Apisto snack. I think I'll stick with Excel spot treatments for now...ARRGH!