I only have a 75 gallon tank in my listening room, but it's dead quiet with the Eheim canister filter I use. Not sure if Eheim makes canister filters large enough for a tank as large as yours, but maybe Johnsonwu can speak to that.
Stereo and Fish tanks - noisy need help
I have recently added a 240 gallon freshwater tank in my listening room and it looks incredible. However it is very noisy and has taken away alot of the musical enjoyment. Is there anyone out there that is running a fish tank in their listening room? Is it quiet? What equipment are you using? Any feedback would to helpful!