I have had this one for anout 6 months and iv never heard if make any noises, and yes, it is a seriose preditor, but thats what i luv about em' :D and my other fish are sake from him becasue there in a preditor tank, heres what i have in it:
Oranage Toadfish
Porkipine Puffer
Snowflake eel
Red...