Note: To get an higher succes to an sandstorm breed the air need to be higher placed in the rank then the moss. In this case the wealthy of the moss is so low that it's almost impossible to get an sandstorm after the places are switched. Not sure why they switch in the list but add the first breed moss was placed last in the list (the lv 10) and Air was placed add the middle. After 5 breed air stayed on his place but the moss switched to first on the rank so it's possible that because of breed they switch place. So to get an good succes on sandstorm you moss need to be lower placed than air in the list if he was level 10. The best way to do this is to get 2 moss: 1 level 10 and 1 level 7. Not sure if it switch every X days or does it really get infected by breeds.
To get sandstorm tests[]
Order
Air - Plant / Earth
L
Air
R
Tree
List rank
Tree - Air
Level L
10
Level R
10
Note: Strangely the air don't get add to the result even if he's placed left. Before I write my breeds down my tree was level 9 and then I got an moss the first time but the second time an willow. So I think to get an sandstorm more easy your tree should be lower then your air dragon. So: