My friend gave me a tank she was no longer using. She gave me a heater, filter, gravel, decorations, and a thermometer. The tank is 10 gallons. I was just wondering what types of fish you recommend. I haven't owned fish in a long time. How many fish can I keep in a 10 gallon? I know I want a betta, what types of fish can be kept with betas? Thanks for any help in advance!