Wow, ive never heard of that before. Learn something new everyday. I've had these guys going on 12 years and haven't had any fish deaths aside from the normal reasons.
True story, I lost 7 archer fish, 5 plecos and 6-8 5"+ roselines after I did tank maintenance. I unplugged my wave makers, airstone and fx6, got caught up with my girlfriends birthday. Went out for about 8hrs came home to fish gulping air at the surface..did not lose a single clown (at that time they were with me for about 10 years) I would have been devastated. I lost some nice plecos that day, it was awful.
Speaking of that, I'm always scared of power outages especially since that incident. What are some contingency plans that yall use to mitigate those circumstances?