Don't waste your money on cheaper filters. This is the best choice and still not expensive. I've found that the holes need to be the right size and shape (slits, not holes) to prevent gravel from getting into the mass. The plastic it is made of is strong enough to last a long time. My only complaint is that the vertical tubes weren't long enough to reach the powerhead, which I chose when hanging it on the edge of the tank. It was fixed with a new hose that I cut to size.
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