My niece recently purchased a betta from pet smart. He's in a 2 gallon tank with 3 ghost shrimp. His water temp is 75 degrees. She's getting mini heater this weekend. She noticed the fish has a slimey build up that she says appears fuzzy. Her shrimp are attempting to clean it but montoya ( the betta ) won't allow it. When she bought him I thought his face looked a bit velvety. I'm sure it's velvet disease or some fungus.... But I'd like opinions and a treatment plan... There are shrimp in the tank. I've never had to treat sick so a step by step would be appreciated. Thank you.