are snails beneficial to a tank?

[Lepisosteus platyrhincus]

yeah iv kept tons with salt in my tank and they did fine

 

[Big fish noob]

I keep snails in my livebearer breeding tank and love them. They do a much better job at cleaning the glass then plecos

 

[Lupin]

....

Most snails you buy are captive bred. They have no more diseases than fish you buy. Unless they are not properly cared for.

To answer the original question; snails are pretty entertaining to watch and clean the tank very well. They clean the glass beautifully and eat any food left on the tank bottom.

I keep snails in my livebearer breeding tank and love them. They do a much better job at cleaning the glass then plecos

Bad bacteria responsible for bacterial infections will always exist. Only through untreated injuries and organ damage will they set in fast on your fish.