If your bare bottom tank is fully cycled then there shouldn t be any issues with the marbles affecting the cycle.
Marbles in 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.
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Bacteria grows and maintains.
When you see fish stick them in their mouthes they are just sucking on them.
Adding decoration and plants if you re wanting to add plants and decoration to your aquarium you may find the substrate you choose can make a difference.
Don t ever clean anything with bleach for your tank because a very small amount a bleach can kill all of your fish.
A cycled tank shows zero ammonia and nitrite and a nitrate reading of less than 40 ppm.
You can add marbles to your tank just clean it well with hot water.
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Yes you can put marbles in your fish tank.
Marbles themselves are generally safe for use in aquariums.
You ve probably seen large aquariums with multi layered substrates that are full of lush living plants.
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.