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i use one on my quarantine tank. i think its fine as the load is always very light on that tank...a ten gallon. also i don't think you clean then until they begin having trouble spinning. i think most peoples gripe with them is the inability to process nitrates because they only colonize aerobic bacteria(oxygen loving). i would only use them on a small tank, which i do, because frequent water changes are the easiest and cheapest filtration on small systems. so i say use it but keep a good water change schedule. jmo.
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