> Not necessarily.  My aquarium has a Hagen Fluval filter/pump that looks
> a lot like the one in this tank and it does cause some moderate to heavy
> seas.

I see. I didn't expect that due to the pump. I thought they produce a rather
smooth flow.
Well... I never had an aquarium since it always is/was in conflict with the
interests of my cat.... *g*

BTW: modelling a fish seems to be interesting. Maybe I will start with a
fish as soon as my fern scene is finished (if ever)
regards
SY

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