The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
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They sell all sizes, including "crumbs" of about 6 inches long, which I used to anchor a Java fern or two. Sinks like a stone, you can describe the type/size of piece you want in great detail, fast ship, and even a "driftwood care sheet" with the order. I was very happy with them--