Ive had my betta now for a week and I got him a Petsmart. I have a 1 gallon with a airpump. Today I got a thermometer so i can see what the temperature is and it is 74 degreese. Tomorrow I am gonna do a water change and im gonna get a heater. All my betta does is stay at bottom of tank go up for air and he hasnt been eating for 4 days. I know for a fact that he is depressed. Before he use to stay at top corner of tank now he stays at bottom. Will the water change and heater make him happier and make him start eating??