Hey Tom, this isn't a diagram per say, but it has lots of 'tank diaries' in it which you may find helpful.
http://reefcentral.com/forums/forumd...s=&forumid=252
Here's an example:
http://reefcentral.com/forums/showth...hreadid=679385
Just go through the forum and you'll find some good threads.
Hope that helps.