I will try to take a photo of the exhibit itself, though I've since removed the zebra due to pathfinding errors.

it's not a matter of volume but rather sizes in squares. Tank volume takes into account depht. I will check if there's an issue.

Ah, that makes sense! The tank size is 432 though, is it still normal?

they have a minimum space need to move. If you place the vanilla bull huss on size 100 deep tank it will not swim when fully grown

Heads up- put a grown up zebra in a tank packed with corals and rocks and kelps and whatnot [modded ones in particular, might be worth noting] w/ a 3/3 space free, and it seemed to have issues with pathfinding as despite using its swimming animation, it never moved despite repeat attempts to remove and re-add it. Felt this pathfinding thing may be worth looking into!