Forum:Majora' s Mask: The last Heart Container?

Hi,

I am playing The Legend of Zelda: Majora's Mask with the aim to finish it 100%. I have everything except two Heart Containers: I am sure that one can be obtained by getting all the Heart Pieces on the moon, but is there a fifth "full" container, maybe to get after defeating one of Majora's forms? I am asking this because I have read a guide to all the pieces, and I think I have all of them, except the ones on the moon. But the missing hearts are still two. Can anyone help me? Thanks in advance and sorry for any english errors ^^