I really like the Hydors I have two #4's in my 90 and they work great. I have yet to even clean them once in 4 months and have had no issues, unlike the seios that would crap out after a couple weeks of use.
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- Greg
90G : Light - Tek 6xT5 | Skim - EuroReef RS135 | Flow - 2xVortech MP40W | Control - Reef Keeper 2
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