Hi,
I think Marine Depot sells them:

http://www.marinedepot.com/aquarium_...ex.asp?CartId=

And all things Ehiem.

So you can decide.

The Tom's*(no relation) nano canister is cool, 80 gph, 37$.

The Via Aqua 300 is about right, get extra sponge sets.
Your bubble rate is still pretty high even with the size diameter issues.

But you have a good avatar!
Botia are one of my favorite genera.


Regards,
Tom Barr