Jaden wrote:


Jewel 120L tank. (28G?)
Standard Filter. particulate filter cleaned/replaced every week. Others
as per recommended schedule (Activated filter changed once, others
untouched.)
Standard Lights - On for 5-6 hours a day.
2 Inches of gravel, washed and boiled.
Well-ish planted. Some grasses and a couple of Amazon Swords.
6 Inch Airstone, on for ~90 minutes a day.
Temperature - 78f.
Hard water area, pH from tap 7.1 - 7.2

I wouldn't worry about the Ph if the fish are doing well. I would worry about
the plants with only 5-6 hours of "standard" light. Twelve hours a day of 2
watts per gallon is more the norm for planted tanks.

Either run the airstone all the time, or at least all night, or forget about
it. Ninety minutes doesn't do much.

--
It's turtles, all the way down