Marbles themselves are generally safe for use in aquariums.
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.
You ve probably seen large aquariums with multi layered substrates that are full of lush living plants.
You ve probably also seen fish bowls with a layer of beautifully colored marbles serve as a home for a single betta fish.
If your bare bottom tank is fully cycled then there shouldn t be any issues with the marbles affecting the cycle.
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Don t ever clean anything with bleach for your tank because a very small amount a bleach can kill all of your fish.
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.
Bacteria grows and maintains.
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.
A cycled tank shows zero ammonia and nitrite and a nitrate reading of less than 40 ppm.
When you see fish stick them in their mouthes they are just sucking on them.
For the most as a decoration point of view marbles are safe to use in fish tanks.
Their use can vary and they do come with some quirks that are good and bad in equal measure.