
How do I stop my nautiluses from suffocating in this aquarium?
Right after finishing this aquarium, I received the message that my Zombie Nautilus had suffocated in a wall. This was very random as there's nothing in the aquarium that would cause them to dash (pufferfish) and they should be able to maneuver through all the 1-block spaces. Could it be the waterlogged copper grates on the ceiling? It's concerning as I have two more Zombie Nautiluses and quite a few regular nautiluses in here, and I don't want to lose anymore.
Edit: Noticed I'm missing a turtle too so the issue seems even worse than I thought...something is claiming my large aquatic mobs :(