Bloomz allows you to add any number of admins to your community page. To invite other School Admins to your community - 

• Click on the community name in the left navigation tray
  
• Click Manage 
• Click Staff tab
• Click + Members blue button on the top right of the community page. 
• Click School Admin
• Click Type Emails Manually
• Enter the email of the School Admin
• Edit the Invite text
• Click Send