[mseepman]

I concur with Sphelps...but you can also get replacement fans from Coralife and it will probably be quiet for a while before it too gets noisy.

If you go with the PC fan option, there are several good fans out there that are really quite quiet. You could also put more than one fan in as I found multiple spots when I opened my fixture. Since you have to re-wire the DC fan in anyway, doing two is just as easy.