Golden rainbow fish eggs

Golden rainbow fish eggs are a reward from fishing rainbow fish, used in the Aquarium of a player-owned house. They can be found in four ways:
 * As a rare reward from fishing rainbow fish (level 38 Fishing required) -- approximately 3 hours on average to get the egg.
 * As the random golden fish egg received from prawn balls. There is a 1/200 chance of getting this reward from prawn balls, and it will give a random fish egg that you do not already have, with no Fishing level requirement.
 * As the random golden fish egg received at Tier 2 from the Prawnbroker using the prawn perks.
 * From a golden prawn cracker. When the cracker is used on another player, it will give both players a random golden fish egg they do not already have.

The eggs can be used on the bathysphere in your aquarium to put a rainbow fish inside the fish tank. Putting it in the tank will unlock one prawn perk, which can be spent at the Prawnbroker