Dissipating water flow from a power filter (plus PS on Kribs)

Hi Everyone,

Thanks to all who gave me advice on a more striking fish (or pair of
fish) for my community tank. In the end I got a beautiful pair of
Dwarf Gouramis who seem very happy in their new home. However, "Mr.
Gourami" has decided, after two days in the tank, to build a
bubblenest and my filter is making this more difficult for him. He is
still managing, having found a quieter place in the tank where my
floating plants (Salvinia natans) collect. But if the angle of flow
moves just a little bit, as happens when I'm cleaning the glass or
using the gravel vac his efforts are blown away.

I'm thinking of rigging something up which will dissapate the flow but
I have some questions:

Firstly, will dissipating the flow adversly affect the tank in any
way? (My understanding is that it should be fine so long as I keep up
my normal maintenance routine - flow is only absolutely necessary in
reef tanks??)

Secondly - what is the best way of going about this? I have in mind
simply using some aquarium tubing with holes punched all the way
along, attached to the filter outlet at one end and fixed all along
the back wall of the tank with rubber suckers. I've never done this
before though so maybe there are some kits to do this kind of thing?

Any advice anyone has would be really appreciated.

Many thanks,

Sal Fox

PS: In a previous discussion about Kribs someone said that a 15 UK
Gallon (18 US Gallon) tank would be too small for a pair of Kribs on
their own. I'm not prepared to put fish in conditions which are not
suitable for them - I would rather miss out on keeping them - but
I've also read in several sources that they would be very happy in a
tank that size. Can anyone shed any light?