Do your fish show signs of stress in the am? Are they gasping for air at the surface? If they don't show any signs of stress, I wouldn't bother with it.

Does the air pump affect traces at all or just co2?

The air pump shouldn't have any effects on anything other than the gas content of the water.

 

Yup, just to echo what Bert stated, the air pump won't have an effect on the trace dosings, just gas content like CO2.

It doesn't souund like there's a lot of CO2 in the water in the first place, so maybe a pump at night isn't necessary. But check how your fish react in the morning. If they're at the surface and plucking at the surface of the water, then run the pump, or decrease CO2.

-John N.