I vouch for the Hydor Koralias, too. I've had lots of problems with the Tunze Nanostreams, and none with the Koralia that I picked up a few months ago.
The Vortechs are so expensive, and it's fairly limited. I don't think heat would be much of an issue with the Koralias, because they operate on such a low wattage, respectively.
The flow you could achieve with three or four Koralia 4's would be much better, IMO.
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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