That's a good point, achase. If your parameters are stable, you don't have your light on for too long and you don't overfeed, you shouldn't have problems with algae. The only tanks I'm having algae problems with right now are my 29gal (too much light and no CO2...yet) and my 55gal (having serious issues with diatoms, which is weird 'cuz I actually don't feed that much). Added to that, a 5gal tank really isn't THAT big, so cleaning it manually should take all of 5 minutes.