What are the best fish to start with. I am a complete beginner as i want a tank i can be proud of. I believe i have a tank that could be anywhere from 20-40 gallon's though i am not fully sure(I am going to get my husband to take some measurements today) I want something that can be hardy but not grow up to be really huge but something that is actually nice to look at(I have had mostly tetra's and guppie's and all though i like them they are never that interesting to look at)