Sea Dragon Combinations
Sea + Terra = Mud or Waterfall
Sea + Flame = Cloud or Blizzard
Sea + Nature = Nenufar or Coral
Sea + Electric = Storm or Lantern
Sea + Ice = Ice Cube or Ice Cream
Sea + Metal = Seashell or Mercury
Sea + Dark = Petroleum or Pirate
Opposite Elements
Below is a quick chart from wikia of the opposite elements that cannot be bred directly.