Put the rock in the container and use a tooth brush to clean them. Thats the way I clean them if needed. If it's really bad... siphon salt water into a container... put the rock in the container and clean it there.. then put it back into the tank. Also Turbo snails are pigs and will really work over those rocks. If you can find Mexican Turbos, they eat bubble algae too. I watched a video on youtube about a guy who wants to clean his rock, so he boiled them...I never tried, but i think you can look for it. Good luck!
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