I just got my new tunze 6045 and these things are awesome. I been using Koralia 4's in my 90gal and i really don't like the flow...its a "V" shape with water only coming out the top. the nano streams is more of a stream type flow which is soooooooooooo much easier to direct the flow where you want it go. You can also place the nano stream A LOT closer to the water surface without sucking in air. The nano are about 1/3 the size of the Koralia 4's and put out more flow when you do a simple mod.
Tunze has really impressed me again.....

Tunze has really impressed me again.....