Ihave no room for a fuge. I have taken a plastic basket filled it with cheeto and rubble and keep a light on it in my sump. I don't know what else to do but buy more pods OR try feeding them so they will populate on their own. What is a micro? I have a 75 gal tank, bubbleblaster 2000, gfo, 20 gal sump, 9.5 mag pump, not room for more. Bubba