Fish Troubles, What do I do?!?

It seems like a pleasant tank. But if you wanted to change things up a bit, you could change the type of gravel to look less artificial. You could even change it to sand, though that would be a bigger project than you might want to get in to. As far as plants, you could add more just keep in mind the size of your tank. Maybe add some zebra danios and a few more bottom feeders like clown loaches or a cory cat. You could even convert it to a cichlid tank, they are very lively fish and are constantly moving with nice color. Of course the other option is turning it saltwater but thats a whole different story haha. Good luck