Okay so I have a 20 gallon tank and I currently have 2 goldfish and one minnow. I want another fish but I'm not sure what. I want a smart fish that can somewhat "bond" with me. Don't tell me my tank is too small because my goldfish grow very very slow and eventually I will upgrade. Anyway I want another freshwater fish that gets a long with my goldfish but the minnow not so important. I take great care of my fish and have nursed one of my goldfish from near death back to health twice. So I do not want to get rid of my goldfish but I want something new. Thanks