There are a lot of resources in breeding fish in a large aquarium (now called an Alien Containment Tank) that fits inside a multipurpose room, but there is very little information I could find about the smaller aquarium (just called Aquarium).
Basically I built one in my Cyclops, and wanted to stock it with bladderfish so I could easily farm water while away from my base. I put two in there, and I know it takes time, but it's been several day/night cycles and there are still only two. Does anyone know if they will actually breed, or do I just need to fill them up with 8 fish (max # of slots) and perhaps just make multiple tanks as a storage.
I already have a growbed on the sub, with chinese potato plants (15health/3thirst), so looking to extend the duration of my voyages without having to make a bunch of cured fish, which doesn't help the water situation, and can't put a filtration system on the Cyclops.
It's been about 10-12 day/night cycles, and still only 2 bladderfish, starting to lose hope...