I put 'zen_' in the configure.php file. I hope that would be okay. Going through zc_install now

If you wish to change the database table prefixes, enter the new prefix below. NOTE: please verify that the prefix name is not already used in your database, as we do not check for such duplication. Using an already-existing table prefix will corrupt your database.
Enter the NEW Table-Prefix:
should I use 'zen_' or blank or new prefix?