Assuming it's not sand and is more larger gravel so doesnt create sulfur due to lack of oxygen. Is it necessary? I have plants and fail to see the benefits of gravel vacuuming. My beneficial bacteria and weekly water changes of about 40% are removing the ammonia so wouldn't the waste just be nutrition for the plants like in the "wild" there are also products you can buy that can naturally aid the process of the matter breaking down.
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