Just got my new Hydor Koralia 1 pump for my 12g Nano. All I have to say is PERFECT!!! I had tried the Tunze NanoStream 6025 when it first came out, but no matter how I poitioned it, it turned my tank into a snow globe. I mean no disrespect to the pump or manufacturer, it was just too much pump for a 12g nano IMO. This Hydor is completely silent, and has the perfect flow pattern for a small tank. It is moving all sorts of water, but it's really wide flow pattern doesn't blow sand all over the place, or knock any of my frags around. Let's hear some more feedback from others that have this pump.