Update: I notice after a few days of rain, and a couple warm days (in the 60's), I could see the SBS/ GSH/FHM gathering near the dock, so I figured what the heck, and tossed out some pellets. They attacked immediately. So I did it yesterday as well, just a cup or so each time......any reason not to? btw: didn't see the HSB I stocked in late October yet....