So I just wanted to share this experience from a few years ago because after reading through everything on here and doing my own research, I cannot believe what my local pet store let me do. I purchased a 5 gallon starter kit from Walmart and went home to set it up. I let it run for a week, like the pet store told me to do, and then went back to get my fish. I decided I wanted some tropical fish and looked at the Peaceful, Semi-Aggressive, and Aggressive labels. After looking, I asked one of the workers what I could put together and she told me pretty much anything except aggressive. I saw an Angelfish and decided it was pretty and I wanted one. Then I decided I wanted a shark because who doesn't want a shark. And then I saw the Tiger Barbs and thought they would be a nice addition. So the people at the pet store let me walk out with an Angelfish, a Bala Shark & a Tiger Barb. WHAT IN THE WORLD?! How do these shops let people walk out with two fish far too large for a 5 gallon tank & a single fish who really needs to be with a school? After all my research and reading on here, I'm just amazed that they let me do that. I'm so glad I found this site so I can ask questions and make sure I have the right information. So thanks to all of you guys!