I got plenty of bio-load to pinch from a number of tanks. Let's prepare to NUKE!!!this is what I would be doing, if you are not worried about your bio filter I would treat the tank with MB also, if you are do the baths.
What does MB stand for aand what is the difference between the link you posted to the box of Polyguard vs. the bottle of Polyguard you just posted?if going to put MB in the tank, then I would run paragaurd. MB will take care of any bacteria infection.
http://www.seachem.com/paraguard.php
I always take the carbon out, but a WC beforehand sounds like a smart idea since the medicine has to run it's course.....do you treat for a week and then WC and treat again for another week or what?make sure no carbon running and UV off. do a large water change first.
yea, it's around 7-7.4 from the tapand FYI your PH is pretty much neutral. not an issue.