Jake Elmore is expected to soon be added to the Astros’ 25-man active roster. Elmore and Wallace are expected to be available for a game Tuesday against the St. Astros general manager Jeff Luhnow recently mentioned Elmore as being a prime candidate for a promotion. Luhnow praised Elmore’s contribution and said the club planned to bring him back up to the majors when possible. Elmore went 2-for-4 Monday for the RedHawks, raising his average to .300 during OKC’s 3-2 loss to Omaha. The Astros will announce a corresponding roster move to Gonzalez’s demotion Tuesday. Wallace made the Astros’ opening-day roster but struggled mightily, going 1 for 24 with 17 strikeouts, before being sent to the RedHawks.