Question Competing pages question

[tonyprower]

I lost rank on one of my biggest money keywords 'Northern Lights'. My icelandaurora website used to rank #4 for this, now it is more like #74.

A google tech said that he suspects cannibalization, so I have been working to address any keyword cannibalization issues.

My question is about 2 big posts I have about Northern Lights. As you can see, the keywords are very similar.

1. Photographing Northern Lights
2. Northern Lights photo tours.

They have very different purposes. 1 is a technical article on my tutorial blog, the second is a sales page on my tour site.

I would really appreciate some advice to stop these pages working against each other.

Many thanks in advance.