Aquarium or Akvarium 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 Grebenshikov. Former band members have included Anatoly Gunitsky, Dyusha Romanov, Sergey Kuryokhin, and Vsevolod Gakkel.