[etgregoire]

I don't have this filter, but it looks like its rated for up to 175. I would think that would be enough flow.

As far as positioning, I think generally you want the in and out to be in different places so that its pulling flow across the entire tank. As far as positioning 2 intakes, or any powerhead I think the idea is that you want stuff moving in the same direction... or creating some kind of cyclical flow as appose to 2 things moving at each other.

I would just set it up and see how it looks. I think you want to have a gentle movement over the plants, and if it doesn't seem to be achieving that you can see what else you can add to improve.

 

[infamouz23]

If you're not concerned with the level of filtration in your tank, I'd look into a power head.

 

[driftwoodhunter]

Or a Koralia-type circulation pump.

 

[wheatiesl337]

Cannister filters are great for filtration, but have generally not provided my tanks with adequate circulation, even when I have used ones far over-rated for their size. For a heavily planted tank, you will probably have adequate filtration, but not necessarily enough circulation.

I concur with the above koralia powerhead/circulation pump suggestion rather than adding a second cannister.

 

[bababooey]

or a Vortech if you don't want a powerhead taking up alot of space.

I have a mp10 in my 40g and it was worth every penny.