Choosing between a Koralia 4 and a Nanostream 6045

[hershey]

I have a koralia 4 in my tank and it is quite noisy, I've had no problems with the magnet or the powerhead staying where it is tho. I myself am thinking of going with a tunze 6060

[Der_Iron_Chef]

My Koralia gets a bit noisy at times, but it just takes a good soak in some vinegar water to make it right again. The same thing also happened with the Nanostream, but vinegar water never did help the shattered impeller shaft