I've been using these on my snails for several years and they keep their shells well. I have hard water, but sometimes fast-growing snails need extra calcium. They never cloud my water and I put a large bowl in a 5g tank. They will last up to several weeks depending on tank size and conditions.
π³ Hygger Betta Log: Resin Hollow Tree Trunk Ornament for Betta Fish Tank Decor, Wood House Aquarium Accessories
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