I have a 3.5 gallon tank with a filter and a heater. In the tank, I have one male betta fish, one zebra nerite snail, and three ghost shrimp. I am new owning any type of aquarium and an not quite sure how often the water should be changed, or how much should be. At the bottom of the tank is about an inch of gravel.
How often should the water be changed?
How much of the water should be changed?
Does anything need to be done to the gravel, plants (silk and plastic), and decorations?