Re: [OPEN] Fish tank won't be cleaned

After being stuck at "Cleaner" even at 12/12 fish, I checked back after advancing the main quest, and I'm now at "Pristine." The current main objective is "Locate [NPC]," which you get after unlocking the fourth entry in Chapter 5 in the Quest section of the databank. So it looks like, intentionally or not, the tank's condition is gated behind main quest progression.