I bought some to cut down on the phosphates in my tank that are feedind some cyano. I have used phosban in the past. The direactions say leave in the filter sock for 4 days then test. My question is does it stop working after 4 days or is it harmful to the tank after that lenght of time? I would like to run some in a filter bag all the time but need to know if it will hurt. Fish and Xenia is all I have in the tank right now, and only plan to go with some different varietys of zoa's. Any input or adive is welcome and excuse all spelling errors.
Thanks, Rob