LEVEL 1 Clam Waters
Collect the pearls among the small clams, black pearls are worth extra.
To get the Grand Pearl in level one of Aqua Grabber, you must replace the Grand Pearl with the Rock/Pebble nearby:
Here is where you replace the Pearl with the Rock:
LEVEL 2 Soda Seas
As I said earlier I am still working on Level 2, but all I know is that you have to collect all the Cream Soda barrels.