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Discussion Starter · #1 · (Edited)
Can't seem to really find anything good. I saw crushed black lava rock but don't think its the right thing to use as a soil cap. I just want something dark/black, not sand though if possible. I'm leaning more towards gravel but can't find a good one anywhere. Im not sure if flourite dark would cause a nutrient overload as a cap for organic potting soil so i could use some advice on that.
 
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