It is a very shy fish. It usually hides during the day. It will take care of the snail problem. But I am not sure what they eat after snails are gone since I can hardly find mine most of the time. However it is still alive after years of hiding.
I thought puffer fish is salt water fish. The sales person told me it is ok to keep it in fresh water when they are young. But what happens when they get bigger? Any one had it in fresh water tank for long?