OCALA, Fla. – A 31-year-old Ocala high school teacher was arrested Friday on allegations of having sex with a student who was living in his home.Ocala police said Nick Elder, a teacher at Vanguard High School, was arrested on charges of unlawful sex with a minor.According to an Ocala police arrest affidavit, an anonymous complaint to the Department of Children and Families earlier this month stated that Elder was involved in inappropriate activity with two students at Vanguard High.The DCF alerted the school, and Elder was placed on leave, police said.A detective spoke with a 17-year-old girl, who said she met Elder on Tinder and ended up in a relationship with him, the affidavit stated.