Exo Terra Moss Ball

I use these in my turtle tanks and they work great for odor control. Definitely try it. If it can keep a turtle tank from smelling then a fish tank will be easy.

Great balls. Keeps water clear, nitrites down and odor down.

It's like a extra filter.

Great for the price.

I recommend getting 2-4 per 20 gallons of water.

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I have purchased so many of these moss balls. I have an aquatic turtle and it helps keep the water clean for a longer period of time.

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Great product if you have turtles. It keeps the tank clean and reduce algae buildup. It helps with keeping the water clean and the odor controlled. My tank doesn't smell so bad anymore even though I did water changes or cleaning the whole tank. Plus I have fish inside too.

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Attractive. It sank in my dirted aquarium within an hour, and took more than two days to sink in my normal one. I can't tell if it's doing any good. I think I'll get a real one, next time.

Update: I just bought another one. How fast they sink depends on the amount of organic matter in your aquarium, I think. They really do clear the water up almost instantly! There are some problems they can't fix they're not a miracle solution but the difference, for me, in both my aquariums, has been worth noticing.

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