I'm thinking of getting a 2.5- 4 gallon fish tank. I'm getting a male betta fish. Which tankmates do you recommend? I've heard Assassin snails are good, but are there any fish that would be compatible with a tank of this size and a betta? Also, do they need any additional food or care? The tank will be filtered. I'm going to have an artificial plant as well as some sort of aquarium décor. Please include info about what the suggested animals respective needs (food, filter, temperature, additional care, etc.) are.