Tank made his mixed martial arts debut in 1995 at UFC 6. In his opening fight, he knocked out John Matua, who weighed 400 lbs, in 18 seconds. Later that night he TKOd 300lbs Paul Varelans in 1:53sec. His third fight of the night against 210llbs Oleg Taktarov lasted over 17 minutes before tank succumbed to a rear naked choke. Both men collapsed in exhaustion after the fight, and Taktarov had to be carried out of the cage.