What are your experiences with AF Calanus when you feed. I sprinkle a little over my night frozen feed. The problem I have is the amount of this stuff that stays floating on the surface. I have a shut off valve when feeding so food does not end up in my sump and gets consumed but I now have to wait for 30min to an hour to make sure this stuff is gone. Below is a pic of what AF Calanus looks like floating around.