Frederik writes:
To be precise: I'm not looking for bucket-type surge devices, but
internal, pump-driven wave creating devices.

I'm still not sure what you are meaning.
Are you looking for "tuned output of pumps" to create standing waves
or do you want a siphon surge.

http://saltaquarium.about.com/cs/sur...l/aa092499.htm

http://www.hawkfish.org/snailman/ssurge.htm

http://saltaquarium.about.com/od/diy...kersurgedevic/
has several links, but about.com kinda acts as a content stealer.
if you look at the URL, you can usually extract the source URL.


If I can find some cheap, tank safe, marine, water valve solenoids
I'd do this:

Plumb a trunk line the width of the tank with a solenoid controled
nozzel every few inches. one nozzel would be left unvalved as a
failsafe to releive pump pressure.

Each solenoid would then be switched on/off at random by a controling
circuit. Light timers could be used for a less random, but less
complicated control. (I'd consider using X10)

--
be safe.
flip
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