On Tue, 11 Apr 2006 12:51:40 GMT, CanadianPonder©
wrote:

I have never added chemicals or tested the water.

Am putting your name on the "may have to eat words" list. )

*** How much "guck/particles" should I clean ?

You can suck the bottom clean, any bacteria there is usually covered with
mulm and goes anaerobic. Exception would be if there is green fuzz algae
(like grass) growing, then I wouldn't bother it. ~ jan

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(Do you know where your water quality is?)