Marco rocks are nice looking, not sure how they hold up long term. But I just got a bunch that look really cool just have to find my happy place with aquascaping them.
Did some looking and while I'm no expert it is made from coral rock and I would think it is OK. However, if not intended for the aquarium trade I would be concerned of any impurities it might have picked up along the way. If you know the source and the rock is clean I'd say go for it.
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