Vlad A4, Glent, and Mark plan a massive prank on Rivi by turning her bed into an aquarium with fish, complete with decorations and a working pool system. They spend the day building the setup, despite encountering various setbacks and mishaps. They manage to complete the project just in time for Rivi's return, and she is shocked and amazed by the elaborate prank.
Here are the key facts extracted from the text:
1. The participants in the prank are Vlad A4, Glent, Mark, and Rivi.
2. Vlad A4, Glent, and Mark are planning a prank on Rivi.
3. The prank involves turning Rivi's bed into an aquarium.
4. The group goes to a hardware store to buy materials for the prank.
5. They buy pipes, liquid glass, sealant, and other materials to build the aquarium.
6. Mark is in charge of decor and buys various decorations for the aquarium.
7. The group assembles the aquarium and fills it with water.
8. They add decorations, including seaweed, stones, and plastic fish that appear to come to life in the water.
9. A remote-controlled shark is also added to the aquarium.
10. The group tests the aquarium and makes sure it is safe and secure.
11. Rivi returns to her room and discovers the prank, which she finds shocking and surprising.
12. The prank is revealed to be a successful and epic joke.