Daily Full backup on "dedicated" tapes for each slot

Firstly, you'll need to partition your tape library, see my article for details:

https://www-secure.symantec.com/connect/articles/backup-exec-12-and-multi-slot-robotic-tape-libraries

Once you've done that, you'll need to create 1 selection list including all items for your full backup, then 5 different backup jobs, one for each day of the week.

Target each specific backup job to the specific partition (or tape) that you'd like and that should ensure that you get the right data on the right tapes.

These should get you started.
http://seer.entsupport.symantec.com/docs/206843.htm
http://seer.entsupport.symantec.com/docs/262055.htm

Thank you for such a quick reply, I'll get right on these suggestions.

To add to Scott's answer

for Mon-Wed use a media set with a 6 day OPP (Overwrite Protection Period) 

if you want THU and FRI on the same tape, you need to either make the FRI job Append, or run the same job THU and FRI, defined as Append, else Overwrite with a different media set and OPP 

I'd probably go with two jobs, THU as Overwrite and FRI as append to the same media set