If you're growing aloe for its medicinal properties, it's a good idea to water your aloe plants from the bottom. Aloe plants use their roots to absorb nutrients, so if you water them from the top, they may be shorting out on nutrients.
A healthy plant will usually have a few leaves hanging over the pot. Water in the morning and check the plants again at noon. If they are still looking healthy, you can add a little more water and check them again at dinner.