Tuffa is commonly sold for tanks at stores that don't know any better, it is good for decorationg a rock garden but not your tank.. the reason is it is a bunch of minerals that are bound in softer stone that water can erode away. this is why it is so pourous. but with this also come the ability for our tanks to erode it further causing a release of mineral, most comonly iron which can lead to lots of algae blooms. Lava rock is also a bad choice as you never know what the chemical composition of it is.
Steve
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