A 30-year-old teacher who works at Stetson Hills Elementary School was arrested Friday after police received a Safe2Tell tip about an inappropriate relationship between a teacher and a student.Christopher Markham, a paraprofessional at the school's library, is suspected of sexual assault on a child by one in a position of trust, Colorado Springs police said.Markham was an English teacher at Vista Ridge High until December, when he transferred to Stetson Hills Elementary, the police said.Safe2Tell is a hotline where students and others can anonymously report any circumstances that may endanger a youth, family member or other community members.