I was browsing some of the FB African Cichlid Groups and I havent seen so many air bubbles since 1986 when the trend was undergravel filters. I must be missing something. Is bubbling air making a comeback? I personnaly like my tanks as silent as possible and the constant bubbling would wear on me. I think I get the economics of running an air header and sponge filters if you have a fish room or a fish store. But as a hobbyiest, whats up with this?