Okay, these are stones. Like black stones knocked down to look like polished obsidian (well, not that shiny). But they are cute. If you have Baby Biorb I would say no. If you have 8 gallons, they're fine, but they'll cover the bottom. I have 16 gallons and they look great. I add an image. My biorb was going to be in our kitchen and we have a lot of seaweed so I figured plastic plants would do and rocks would do because they are black, decorative and easy to clean. So my aquascaping is as minimal as possible. Anyway, I hope the feng shui works and that my goldfish (yes I have kept a goldfish in Biorbe for THREE years and they are doing great thank you) and anything negative that we may come across is also left behind. If you need a bag of polished stones for your aquarium, you can't go wrong here :-) Talk about a low maintenance addition!
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