Lava rock floating

Tigerburp

How do I make it sink
 

MacZ

Not at all. If it floats you have a type of volcanic rock called pumice. It has trapped lots of gas inside, which can't be removed without completely destroying the rock.
You can scrape calluses with that, but it's not usable in a fish tank.
 

Tigerburp

Not at all. If it floats you have a type of volcanic rock called pumice. It has trapped lots of gas inside, which can't be removed without completely destroying the rock.
You can scrape calluses with that, but it's not usable in a fish tank.
So what can I use it for?, and it looks similar to other rocks that I bought which sink
 

MacZ

So what can I use it for?
Paperweight on your desk? I see no use for a floating piece of rock in a fishtank.
 

Tigerburp

Paperweight on your desk? I see no use for a floating piece of rock in a fishtank.
So I heard some people use it as filter media
 

MacZ

If it doesn't sink it doesn't work as media in a filter either.
You could put it in a fabric bag and smash it to pieces with a hammer (please do it in a bag so it doesn't get everywhere), those pieces that don't float can be used as media.
 

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