yea u can put two or only one in...people say yopu need three to get along but two of different shapes will work, so yea it will work i have a 55 with a naso and a yellow, dont be surprised if the yelloe starts backing into the yellow eyed kole for a few hours, its just telling the kole that he was here first, but in the morning they should get along, if you want you could put a yellow kole and blue to school