The Star Wars Jedi: Survivor fish tank is one of the many hinted activities in Pyloon's Saloon on Koboh. After you head to the Forest Array and return to the Mantis and unlock the upper floor of the saloon, you can access the fish tank, though it's definitely seen better days. Like Holo Tactics, you'll have to locate an NPC who can help you out.
If you're still exploring Koboh, then you might want to know where to find more Priorite Shards to trade with Doma, or Datadiscs to decrypt with Zee for extra perks. Otherwise, here's how to clean the fish tank in Star Wars Jedi: Survivor.
