Board Thread:General Discussion/@comment-4008402-20131010153506/@comment-26394913-20150713032704

Ellisk wrote: It is absolutely possible to make any monster 100% HAPPY. I usually do have every monster 100% HAPPY on all of my islands.

Of course yours are at 100% happiness because you already have the 2-element monsters on your Ethereal Island. As Monsterk was saying, it's impossible for them to have their Etherals currently at 100% while they are attempting to breed for the 2-element monsters because the required items for 100% happiness of the single element monsters include hybrids. The highest you can initially breed your single element ethereals at is 75%.