What are the rings at the bottom of my plants?

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barterking85

Aquarium Advice Addict
Joined
Feb 25, 2011
Messages
2,532
Location
Canada, Nova Scotia
Was wondering what is the ceramic ring at the bottom of my plants u buy at chain stores it looks like a ceramic ring with a sponge in it do I remove it or leave it on I would like to leave it on cause it's easy to plant my other plants without them never stay in the sand

Do you know where I can buy some of them I really like them?
 
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