Nanostream vs. Koralia

[BioCube14]

from what ive heard they both have their good and bad sides i guess

[glennr1978]

I have not had the chance to try the Koralia out, but I do have nano streams.

The nano streams had some problems for a while, such as the clips, the mount cracking, and the pump chattering. For the most part, all of the bugs have been worked out with the newer nano streams.
The other thing about Tunze that just cant be beat is the customer service. As most of you know, Tunze USA is in Austin, and run by Roger (the epitome of customer service).
Check out the Tunze forum on RC, there are countless threads:
Customer: "My 6025 is noisy"
Rodger: "Sure, send it back and we will send you a new one"
You cant put a price on that IMO

I didn't even have to send mine back. I contacted Roger about a clip that broke on one of my 6025's and also mentioned that I had problems with one of them not starting up sometimes after feeding my fish. He sent me a new 6025 motor no questions asked, along with 2 of the new mounting clips. Tunze customer sevice can't be beat.