For the most as a decoration point of view marbles are safe to use in fish tanks.
Marbles in fish tank.
You ve probably seen large aquariums with multi layered substrates that are full of lush living plants.
Yes you can put marbles in your fish tank.
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.
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If your bare bottom tank is fully cycled then there shouldn t be any issues with the marbles affecting the cycle.
Their use can vary and they do come with some quirks that are good and bad in equal measure.
It doesn t do any harm to the fish.
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.
Marbles themselves are generally safe for use in aquariums.
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.
You ve probably also seen fish bowls with a layer of beautifully colored marbles serve as a home for a single betta fish.