
... I saw Martin use German words like "Chinesischer Flossensauger" ... who knows...

MARTIN ... you are NOT going to use a propeller (propelling screw) ?!
... with some smart water guidance, the main stream could be in the center - and left and right could be the return-channels. could give the "guys" additional space to stick on the guidance sheets. Depending on design of channels, different speeds may be designed, possibly more - using the "arrival" glas (changes direction - U-turn function) as additional speed. Or ... design the channels not-parrallel and gain cone/diffoser/Injecting effects...
Guidance could also be placed top/bottom.... double bottom tank...
... putting flat stones in to create shadow effects an turbulances...
... wow... good that I have to go to sleep now... possibly I had too much sun, canoeing yesterday... saw a gerat catfish though...
what do you think martin?... just don´t put an entire out-board at the tank

I´ll be with you in my thoughts .. designing....designing...

... come on give as a hint, PLEEEEEASE
Wolfram