Hello, I recently bought 4 small Blue Acara's approx 2 inches long but I am not sure as they look like green terrors. All of them have a yellow tipped dorsal fin and yellow tipped tail. They also have a black blotch midway on each side of their body. Is there anyway of positively identifying them as Blue Acara's? Any help would be appreciated because I dont want them growing up in to green monsters!