I am only on level 370 so just a baby really!! I noticed that the one they recommend with the fishys,doesn't help as much as the one that gives you the purple striped one does.. my experience,hope it helps you too...
I think your idea is more related to game play so I took the liberty to move it over to "Level Help & Tips" on the Discussion board. There you can join the game related conversation and discuss strategy.
Also be sure to take part in our sour competition for free Gold Bars over here