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I have a 65 gal tank I started on Feb, and I have come to realize that there are two types of inhabitants: those that are intentionally place in the tank and those that hitch hike. I notice this "foam" in the crevice of one of my rocks. If I look closely at this with a bright light, I can see critters about 1 mm walking in and around it. It looks almost like it could be an egg sack, but I cannot think of anything that would be responsible for this (snails, crabs, etc). This is located under some zoeys that are doing well. Could be a coincidence, or perhaps these are food. If you have any thoughts on what this may be, I'd like to hear them.