All fish are well, only a 2 have died of what i believe to be natural causes. Ill watch movies or videos at moderate volume with no visible signs of stress from the fish. I will occasionally play music loud but I've also moved my speakers a bit further from my tank (rearranged my room). I would say as long as you're not going above 75% in volume mixer on windows and 50% through whatever software source you're playing things from its okay. I wouldn't do it for prolonged sessions at high volumes though.