Prepare Jell-O to the package instructions. Let it cool completely. Place Jell-O into the fridge and let it set to almost complete.
Slice green apple licorice so it looks like seaweed, and then place it on the bottom of the glass. Sprinkle table spoon of crispy rice cereal onto the bottom of the glass, and then add marshmallow and jellybeans.
Pour Jell-O very carefully one table spoon at the time until it covers the bottom of the decorations, and then pour it until it reaches ½ inch to the top. Place it into the fridge so the Jell-O can set completely.
Insert fishes into the Jell-O, and then place it into the fridge to set completely. Enjoy!