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Have you used "Lava rocks"in your aquarium or you are the one who want to use it in aquarium filter as filtration media or want to create a hardscape with these rocks.
If so, just wait. Are you sure these rocks are safe for your fishes or not? Got confused, Don't worry, just watch this video till end. I am sure you will definitely learn something new and interesting.
After watching this video, decide how will you use these rocks.