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Dave G wrote:

> One dead fish, especially a big one, can dump a lot of nutrients 
> in a tank in a matter of hours.  This is why it is a good reason
> to have a ugf under your gravel, even if it is turned off.
> Sometimes you need it.

Isn't there some danger in turning on a ugf that hasn't been used
for a long time? It can throw up a lot of anaerobic detritus, right?

I like ugf's. Who invented them, anyway?

Cliff Lundberg ~ San Francisco ~ cliff at noevalley_com