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.