Loud noise produced by instruments are found to be harmful to cichlid fishes. This was what authorities found out when they checked on fishes in a nightclub in Sweden. You may read more about the story, Loud beats endanger Swedish nightclub fish, here.
Cichlid Fish (image from thelocal.se)
When I read this news, I am afraid now if my planned mini fish sanctuary at home will suffer if and only if M will try out his audio-visual component at home. Though we don’t have the complete set yet, we don’t have Nord Keyboards which would surely provide a good music also but not really loud music, I still am afraid the possible things to happen to my pet fishes. I guess, I better talk to M on this.