What would adding an extra guide do to my rod?
 

My rod is 230cm (about 7.5 ft) long. It currently has 8 guides and someone told me I should add a ninth, why would I do that, and what would it change? I'm new to fishing, and any help is much appreciated.
-Kiko.

I can't imagine any scenario where one would want to add a guide to a finished rod with the guides already spaced for 8. If you add a ninth you'd almost certainly want to strip off the existing guides and re-space the rod the for nine.

Unless this someone believes the stripper guide is too far from the reel. In that case the guide might be moved, but I still don't get the idea of adding a guide. Maybe someone knows better though.

Not enough detail for an intelligent answer.

A 7.5 foot rod with 8 guides...that sounds like plenty .