Which is better - Internal filter or HOB?

[Guppies Onli]

Now that I'm done with the substrate
(http://www.arofanatics.com/forums/sh...d.php?t=170787)
, I'm going to put in a filter.

I've bought an internal filter, but onli to find that it's too big for my tank (too high). Mine is a standard 2ft tank. I intend to have a low demand light planted tank, without co2 and for keeping mainly shrimps.

This is the filter I bought;

but the flow rate (450l/hr) seems too high for shrimps which I read again and should be not more than 200l/hr.

Is there any good internal filter to recommend that is suitable for such application? Any idea what's the price like?

Also is an internal filter better or HOB better for such purpose?

Sorri for asking so many questions, thank you.