Two questions: 1.) For a 10 gallon freshwater tank, what are the funnest- most active- fish to watch for stocking purposes? 2.) For a 30 gallon freshwater tank, same question. I currently just have neon tetras and corydoras. I'm actually disappointed in the neons. They primarily stay in the back of the tank and aren't much fun to watch. However, I've only had them for a week and it's possible they're still just adjusting. The corys have been great to watch. Thank you!