Aquarium or Akvarium (Аква́риум; often stylized as Åквариум) is a Russian rock group formed in Leningrad (now Saint Petersburg, Russia) in 1972.The band had many member changes over its 40-year history, and at the end the only remaining original member was lead singer and founder Boris Grebenshchikov.Former band members have included Anatoly Gunitsky, Mikhail Feinstein, Dyusha Romanov, Vsevolod Gackel, and Sergey Kuryokhin.