Dissolved Oxygen problem?
I have a tank that seems to have a problem with low dissolved oxygen (fish gasping at the surface unless I run an airstone). Any suggestions on what could be causing this and how I could resolve it? I'd prefer not to run the airstone if possible to maintain some CO2 for the plants.
Details of the tank are below. If there is any useful troubleshooting details I'm leaving out let me know.
Size: 60 gallon (48" x 13" surface area)
CO2: none added
Lighting: 108 watts of HO florescent
Fish: ~20 small fish (patties, glowlight tetras, cory cats, bristlenose plecos)
Nitrate <5 ppm