I don't think this is a bad product but I feel it comes at a high price. Mine came with three small stones. Of course the weight may have been ok but I was expecting more stones (like in the picture) and maybe a bigger size? The seller must provide details of the size and quantity of each stone, not just the weight. I haven't noticed my shrimp paying attention to rocks in any of my tanks, but that doesn't mean they aren't working. I think it's better to be safe than sorry!
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