There are anime specific trackers that are better for downloading anime from, especially if you're looking for non-English subs, but radarr doesn't have a way t

There are anime specific trackers that are better for downloading anime from, especially if you're looking for non-English subs, but radarr doesn't have a way to tell it to use a specific tracker for a particular series, so having a separate radarr instance with only those trackers on it ensures it downloads from them everytime.