"mary" wrote in message
...
well now after doing a partial water change ( 6 gal) and vacuuming
the
gravel in my 20 gal. tank, the nitrates are still a bit high and the
ph
is a bit low,i put in proper ph 7.0, but it still wont come up. what
am
i doing wrong?


--

Are you sure it's nitrates and not nitrites? It is somewhat common to
have elevated nitrite levels immediately after a water change.

What is your ph now?

Mark
http://www.cichliddomain.com