How does one know if snails are getting enough to eat?

[WindeyD]

I have several astro snails and a fighting conch, I want them to have enough to eat but don't want to supplement feeding if I don't have to. I assume they're getting enough as they have been alive for 6+ months. Seems like many inverts face potential starvation so I was wondering if there was any way to know if the food supply is adequate other than longevity; any thoughts?

 

[NobleSun27]

Pay attention to how active they are, like if your conch is on one side of the tank one second and on the other a min later he might be having a hard time finding food and with the snails watch them at night when they are most active, if they are moving around an cleaning the glass they should be fine. If you have a well established tank you shouldn't have anything to worry about but I always break a algae wafer up into couple pieces and throw it in about once every 2 weeks just to keep them happy. Just always pay attention to there behavior.