The Gaia Collection

There are five dragons in this collection:
Seahorse Dragon    
Plankton Dragon
Aurora Dragon
Deep Forest Dragon
Hammer Dragon

Seahorse dragon
sea + nature
EX-II
Breeding takes 16 hours
hatching takes 20h

Plankton Dragon
Sea + Terra
EX-II
Breeding and hatching both take 20h

You need to have high level dragons to get EX-II-b dragons, preferably on level 20 or higher.There are reported instances when the parents have been on a lower level (like 19...)

Aurora Dragon
Electric + Flame
EX-II-b
Breeding and hatching both take 20 hours

Deep Forest Dragon
Nature + Terra
EX-II-b
Breeding and hatching both take 20 hours

Hammer Dragon
Sea + Metal
EX-II-b
Breeding takes 12 hours, hatching 16