CREATE TABLE table_30396 ("Institution" TEXT, "Location" TEXT, "Founded" FLOAT, "Affiliation" TEXT, "Enrollment" FLOAT, "Team Nickname" TEXT, "Primary conference" TEXT)

4512 is the enrollment what is the team nickname?
SELECT "Team Nickname" FROM table_30396 WHERE "Enrollment" = '4512'
SELECT "Team Nickname" FROM "table_30396" WHERE "Enrollment" = '4512'