Underwater Free Desktop Wallpaper
For your convenience, we should combine in a group all the layers composing the bubbles. Make three copies of the new made group and place them the same way it is indicated below.
Copy out two bubbles of any group to place them like in the picture and apply also the Free Transform option to adjust the sizes.
Combine those two bubbles in a group and make 11 copies of this group. Add if that is necessary by one bubble more.