Melt butter in large saucepan over low heat, and add marshmallows. Continue to melt over low heat until it becomes a creamy mixture. 

Add in cereal and stir well to coat all of the cereal. Allow to cool 4-5 minutes before attempting to form rice balls. 

I use two sandwich bags as "gloves" to handle the marshmallow crisped rice "dough" to form into egg-shaped portions. You should be able to make 23-24 rice balls. Place on a platter. If you have a deviled egg tray, it is PERFECT for this treat. 

Once all of the rice balls are formed, top each one with a candy fish and a strip of fruit roll. You should be able to use one fruit roll to complete 3-4 gluten free candy sushi. I find it best to start wrapping the candy sushi rice ball from the underside, pull it over the candy fish, and then connect it to the bit of fruit roll on the bottom.