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Ive tried emerald crabs a few times already and they never seem to eat the bubble algae. My tangs eat them but they can't get into all the crevasses so they won't ever be able to finish off the population. I know vibrant is a common solution but I heard it will kill off macro algae and my refugium is my main nutrient export so I can't lose it. Are their any sea slugs or other inverts that do a good job of eating them?