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Nope, it just blows in the flow. It also takes a few passes of the mag cleaner to get it off. Based on pictures I’ve seen, it seems like normal hair algae and I’ve got some on the rocks as well. Time to get that hermit crab.Does it retract at all like an anemone when you touch it? If not it's probably just hair algae growing onto any speck of something stuck to the glass.