Finally replaced my worn-out tunze blades with these bad boys after three years! These new ones are just as durable and they've made a noticeable difference in water flow already. My corals love 'em - I can actually see the polyps open up more now. The only thing I'd say is that the package could be a bit clearer on which model these fit, but hey, for $12 it's not a deal-breaker.
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