Moh turned professional in 2005, as the winner of the ACBS Asian Under-21 Snooker Championship. In his first season on the main tour, he entered four of the ranking tournaments, but was unable to win a match in any. At the Grand Prix, he was whitewashed 5–0 by Ryan Day, while at the UK Championship, he recovered a 0–3 deficit to lead Paul Davies 7–6, but eventually succumbed 7–9.