Swapping Unit Status from One Unit to Another

Q At our “100 percent” site, all the units are low-income units rented to households that are either 50 percent or 60 percent below area median income (AMI). Upon recertification it was discovered that a resident who initially qualified at 50 percent AMI is now over-income. Can we transfer that resident to a 60 percent unit, increase his rent with proper notice, and thereby free up the 50 percent unit for a qualifying applicant?