Like, is there a max size it can be so the fish wont despawn, assuming theyre named if that changes anything. I wanna build a humongous aquarium, like a 100x100, but Im in a cool ocean biome and want tropical fish in it, but dont wanna go through all the effort to have them despawn
If you're playing on Bedrock, then they will despawn but I dunno how far away that'll happen. If you're playing on Java, named mobs never despawn at all no matter where in the world they wander off to.
100x100 seems way too big! You will need to make sure the water source starts from the bottom up so you can plant seaweed (kelp). I learned that the hard way but on a small scale so it was easy to correct. I put about 50 fish in total in all the tanks and non have despawned so far. No nametags. Just caught via a bucket. Playing on survival on the xbox one so im sure Java Edition is the same.
Check out my aquarium based off Birch Aquarium in San Diego.
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See my Minecraft world (100% Survival), Dirty Baker City here: