It's not just the length of some of these species, but also the girth. Male vieja can get massive as they mature. If you are as new to this as you sound, you might want to start with fish, and a complete system, that are going to be easily managed, and more user friendly. Focus on some specific top 4-5 choices, then do some serious research. Right now it looks like you are all over the map, with no idea what you want to keep in this tank. Good luck.