A good way to test for safe rocks it to drop a couple of drops of ph down on the rock in question.
Is red granite safe for aquariums.
There is absolutely no reason not to use granite in a freshwater aquarium.
If it fizzes its unsafe and shouldn t be used.
But i definitely don t leave it in the aquarium long term.
Granite from my experience is not safe.
Their size and unique coloration makes them ideal accent pieces for smaller aquariums.
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The ideal aquarium to have for using large rocks is a flat bottom acrylic tank but glass aquariums can also be used.
It leeches acid and drops your ph to dangerous levels.
It is typically an inert stone and will not affect water quality.
Granite is about the safest rock to put in an aquarium.
They are locally and sustainably sourced.
These rocks are highly recognized for being safe rocks for freshwater aquarium.
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.
You may be lucky finding it in nature but they are available in your local fish store.
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.
If anything it would make a sand like material when crushed or ground up.
After finding this out the hard way i now use it to reduce my ph if needed by placing it in the aquarium for a day or three.