Dennerle quartz gravel is suitable for bottom dwelling fish. As their sensitive barbels could injure themselves on the sharp edges of gravel grains while foraging, the fine gravel grains from Dennerle are suitable. The gravel grains are free of hardness; they have a grain size of 1-2 mm, are rounded in a ball mill and dyed with food coloring. They should be rinsed thoroughly before use.
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