The need for aeration at night depends on many factors: surface agitation, evaporation speed, CO2 levels, the reliability of the solenoid, the type of the regulator, the quality of the needle valve, the fish load, the plant load, the water temperature, medications used, amount of decaying matter, your tiredness level, and the phase of the Moon. If anything can go wrong, it will.
The safety factor of an airstone/wand becomes so obvious the first time you wake up to a tank full of dead fish.
Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD