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Here's my solution to river rapids tank ... although I have to increase the powerhead:

http://www.youtube.com/watch?v=V-vhy8ZLAyE

What do you think?

Doesn't look very rapid to me

I think no powerhead can replace the amount of waterflow that is in a real rapid riversystem.

This might be an idea:

http://www.loaches.com/articles/river-t ... old-design

I have already seen the project but I do not think I can do a unidirectional movement

Sorry I got bored & turned off , scooter had more power to me

This test is 100x30x40 cm tank with 30cm of water column with pump 700 L / H

The final will 100x40x50 tank with 35 cm of water column so I thought a total movement of 2500-3000 L / H

Hi Mauro

It is a really interesting concept, I am impressed .

From a flow rate point of view, I wonder if it would increase the flow from one side to teh other if you increase the differential of the two water columns as much as possible. That waay you also have the additional (if only a little) increase in water movement from teh LHS to the right. Although it may be a little noisy to have in the livingroom.

Keep us informed I would like to see what it ended up like

Rob

I think it's a cool idea, just needs a bigger pump. Also want to see it set up and how the fish react to it. I like the thought of driving a subcurrent right where the fish are.