How to get the Rare Treasure Soda Seas Levels in Aqua Grabber

First you must put the soda barrels in the net. Then get a worm and catch Fluffy. Get Fluffy in front of the mullet and then put the mullet in the net or let it go. Then, go down and you will see the crab :) If you take all the crab's money you will get a stamp. Hope this helped!