Skyward Sword 4th Dousing Ability?

[TrueChaos]

After a while you get the 4 extra dousing spaces. I'm in Hero Mode and in both play throughs i can douse for goddess cubes, treasure and gratitude crystals.

is there a 4th item i can douse that i've not been able to find? seems a bit stupid to give you 4 extra dousing spaces if there are only 3 extra things to douse for

 

[cams]

Talk to one of the Mogma at the south of Eldin Volcano. He's in a underground room where there were fire coming out of pillars creating a small maze.
Then Fi will give you Rupee dowsing.

 

[TrueChaos]

ah, awesome, thanks

 

[bobenstien]

how do u get bug dowsing

 

[UraZelda]

you cant but how many times do i have to get low hearts to get heart dowsing