I have a home depot bucket full of gravel and another half full of fine grain gravel. I also have a 20g undergravel filter, without the top things but you could attatch your powerheads to them, I think. I have a 10g undergravel filter with the carbon cartridges. $15 for it all. I might even throw some other stuff in there if I can find it.
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WTS gravel, undergravel filters
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