Flow in a cube

[jameson_uk]

I have a 30cm cube with a JBL Cristalprofi M filter (kind of Hamburg Matten Filter).

This creates flow I kind of a triangular pattern leaving the back corner largely without flow. I have some java fern in that corner which is existing rather than growing which I suspect is down to flow.

Other than replacing the filter (which seems great for shrimp) any ideas to generate a little flow? Even the tiniest powerhead would have far too much flow for a 22l tank

 

[AverageWhiteBloke]

I have a 30cm cube with a JBL Cristalprofi M filter (kind of Hamburg Matten Filter).

This creates flow I kind of a triangular pattern leaving the back corner largely without flow. I have some java fern in that corner which is existing rather than growing which I suspect is down to flow.

Other than replacing the filter (which seems great for shrimp) any ideas to generate a little flow? Even the tiniest powerhead would have far too much flow for a 22l tank

What about the APS surface skimmer. https://www.allpondsolutions.co.uk/aquarium/filters/surface-skimmer/surface-skimmer-250l/ you can turn it right down as it's adjustable, may be a little fast at first when the sponge has just been cleaned but it slows down pretty quick and has the bonus of skimming the surface and a venturi so you can open it up at night and bubble some o2 in.

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[jameson_uk]

What about the APS surface skimmer.

Are these safe for shrimp?

 

[AverageWhiteBloke]

Are these safe for shrimp?

They have a small grill over the top so ok for adults not so for babies. I've seen people put sponge or fine mesh over them though.

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[Edvet]

If there is space enough maybe you can add a small underwaterpump "through"the mattenfilter ( poke an extra hole through it)
I use these to run mattenfilters:

 

[jameson_uk]

If there is space enough maybe you can add a small underwaterpump "through"the mattenfilter ( poke an extra hole through it)

It is not a true mattenfilter but a kind of cross between an internal filter and a true mattenfilter. You could not use anything else behind the foam. I have through about creating a whole 30cm foam wall for a true mattenfilter but I think that is an experiment for another time.....

I think looking at the skimmer that a bog standard sponge filter might be answer as it would take up the same space, give low flow and also give the shrimp something to feed on.
Need to have a think as having the JBL filter in one corner and a sponge filter in the other all inside a 22l tank doesn't seem ideal.