piclist-bounces@mit.edu wrote:
> Dave Tweed wrote:
>> Most fish tank pumps pump air, not water.
> 
> But water pumps are out there.  I know because I bought the
> pump for my temperature controlled water bath at a pet shop
> and it was sold as a "fish tank pump".  Of course that was in
> 1980, so maybe the fish have developed better technology by now.

and of course their own terminology. Often called powerheads.

I used to use a brand called RIO for my reef tank. I recall them 
being less expensive than other brands, and a marine environmnent
is pretty harsh, so they had to be replaced often. It's amazing
how fast the powerheads get completely encrusted by corraline...

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