I know there are a lot of threads like these. But..... I have a 20 long. I'm not wanting to do a planted or marine tank. I also don't want common community fish. I've done bettas too, so not interested in those either. Other than that, I am open to ideas. Whether it be a single fish, or a few, or a tank full. Right now I'm leaning toward brackish. But would rather keep it fresh water. Any ideas?