Granite is about the safest rock to put in an aquarium.
Is red granite safe for aquariums.
They are locally and sustainably sourced.
Granite from my experience is not safe.
It also would not make dust.
If you collect it yourself however make sure you sterilize it by soaking the pieces in hot water then rinsing thoroughly and allowing to cool before use so maybe i will stick with granite remnants only.
These rocks are highly recognized for being safe rocks for freshwater aquarium.
If anything it would make a sand like material when crushed or ground up.
Aquarists recommend this rock because it won t cause ph buffering so it is safe for both fresh and saltwater.
Their size and unique coloration makes them ideal accent pieces for smaller aquariums.
You may be lucky finding it in nature but they are available in your local fish store.
The ideal aquarium to have for using large rocks is a flat bottom acrylic tank but glass aquariums can also be used.
It is typically an inert stone and will not affect water quality.
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If it fizzes its unsafe and shouldn t be used.
But i definitely don t leave it in the aquarium long term.
It leeches acid and drops your ph to dangerous levels.
A good way to test for safe rocks it to drop a couple of drops of ph down on the rock in question.
They are hardscape types of stones that are specifically created by skillful designers to provide a more realistic presence that is ideal for amano or iwagumi kind of aquascaping.