a lot of these predatory fish are labeled as "advanced" just because they are big and predatory, most of them have pretty simple care. florida gar for instance can live in a 40 degree stagnant ditch, yet most website have them labeled as advance all because they are big and have pointy teeth. you have a ton of options, once you have it narrowed down to a few come and ask us about them, we could spend the next 5 months listing off option. not tryng to be dismissive i dont want you to get overwhelmed as people keep throwing options at you, because if youre anything like me you keep saying " ooh i like that one" and end up with 100 fish on your list of possibilities.