Thanks guys, some very interesting information to ponder over. You are absolutely right though, there is not really much relevant information that can be displayed on a webpage that is dealing with cloudy water in an aquarium. If you think about it, the only thing that I can think of that would be available to buy for this problem is just a small bottle of chemical, but you never gonna make a fortune out of that. Plus, it's such an easy problem to fix that not many people would even bother buying it. I suppose what I'm hoping will happen is when people go to the page, the ads are actually displaying information relevant to their own search history. When I'm browsing my website, and other websites I am bombarded by Google ads that are relevant to watches (I collect watches) fishing and sometimes disability websites if I been looking at something to do is disable driving or wheelchairs. Does that make sense?
To be honest, I don't think there are many aquarium shops that bother doing Google advertising, most of them are just high-street shops that probably don't have the money to do that kind of advertising. There are some big name businesses that I have never seen appear on my AdSense units. PetSmart is about the biggest and most common shop in the US that deals with aquatic goods, I don't see them ever, and since there are many search terms that brings my site top at the very top of Google, you would have thought that they would have decided that my site is probably worth advertising on, especially as most of my visitors are from the US
:-), I just picked 200 clicks out of the air Net. You would think that when you are getting 700 people visiting the page every day, 200 of them might click on the ad, I'd be earning a nice little amount from that many clicks. But like you guys have said, if I can put a really relevant advert in its place, in between the heading and the content, that is really attractive to visitors, then the chances are many people will click on it. Just got to find the right way of doing it, I'm convinced there is quite a bit of money to be made from this page, just got to find a way of doing it