I currently have a 20 gallon set up, which I know is a pretty small tank. It's 36x10x12, so the length actually makes it seem a lot bigger than it is. I currently have a couple clowns in there that I bought together less than a week ago. They were in a tank with about 4 other clowns at the LFS. I'm not sure if they've technically paired up or not, but they go everywhere together. I'm not ready to add any tank mates as of yet, but I'd like to add something within the next couple of months. After reading about how territorial clowns can be, especially when paired, I'd really like to do my research before adding anything else in. What kind of fish do you think would be ok with a pair of clownfish? I've considered adding another pair, perhaps some designer clowns, but is this asking for trouble? The LFS also has a couple of green mandarins that he has had for a few months now that are living entirely on frozen food. I'd love one of those, but I don't feel I possess the experience to care for one properly. I'd like to add two more fish, and if I don't do the two clowns, I'd like to do two different kinds. What do you guys recommend? I've added a picture of my tank for reference. Thanks!