At pH 6.9 and kH 15, by formula, your CO2 is right at the level where it may
start being harmful to your fish.

What kind of plants do you have, how long has the tank been up, are you
adding fertilizer, and what is the water temperature? Do you have algae
and, if so, what kind?

kush

Doug Sheely wrote in message
...
These are my current test measurements of my 55g planted community tank.
Any
suggestions?

PH 6.9
KH 15
Nitrite 0
Amonia 0
Phosphate 1.0
Nitrate 20

Plant growth is minimal and no fish distress that I can see. I am fairly
sure that my Co2 level is a little high. Co2 is injected at aproximnately
a
bubble a second. small gravel substrate. Magnum cannister filter. 2 - 55
watt pc lights. Thanks in advance for your suggestions to improve plant
growth and overall health.