I have a couple of Fluvals too and they are killing my tank. They collect nitrates like its nobody's business and for me its gotten to the point where its starting to impact my system and stress me out. Upsides though are they are easy to clean and maintain, and they work wonderfully for draining your tank for a water change!
Sometimes its rather hard to find particular medias though, seems like whenever I'm running low on something, everyone else is too!
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