You ve probably also seen fish bowls with a layer of beautifully colored marbles serve as a home for a single betta fish.
Marbles in fish tank.
When you see fish stick them in their mouthes they are just sucking on them.
Bacteria grows and maintains.
You ve probably seen large aquariums with multi layered substrates that are full of lush living plants.
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Marbles themselves are generally safe for use in aquariums.
If your bare bottom tank is fully cycled then there shouldn t be any issues with the marbles affecting the cycle.
A cycled tank shows zero ammonia and nitrite and a nitrate reading of less than 40 ppm.
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It doesn t do any harm to the fish.
On the other hand if you are breeding fish marbles can be a good substrate because the gaps provide protection and coverage from adult fish who would like to eat the fry.
Their use can vary and they do come with some quirks that are good and bad in equal measure.
Yes you can put marbles in your fish tank.
If you enjoy fish you can choose to set up a bowl or tank that falls anywhere along the spectrum between the two.
You can add marbles to your tank just clean it well with hot water.