Say for example I am working on a site with fish aquariums and there are many unique makes and models.

I am using 2 keywords per page, but should I also use the term "Fish Aquariums Online" (If this is 1 of my selected keywords) over and over with the specific model?

For example:
landing-page.html (2 KY: Fish Aquariums Online, Buy Fish Aquariums)
-->Make-Model.html (2 KY: Fish Aquariums Online [Again?] & model#)
-->Make-Model-2.html (2 KY: Fish Aquariums Online [Again?] & model#2)


Basically,should I repeat one keyword over if it best describes the page?

My title would be something like: Fish Aquariums Online - Model # | Brand