Aquariums Guide

Quick answer: Planet Zoo 2 adds fully aquatic species for the first time in the series — customizable freshwater and saltwater habitats with filtration systems and staff airlocks. Confirmed species include Black-tipped Reef Sharks, Hawksbill Turtles, Great Hammerhead Sharks and Axolotls.

How aquariums work

Aquariums are not placeable tanks — they are true customizable habitats:

Freshwater and saltwater environments, each with their own requirements
Filtration systems — water quality is a live mechanic you manage
Staff airlock — keepers enter water habitats through an airlock
Built with the normal piece-by-piece habitat tools, so every aquarium can look unique

Confirmed aquatic species

Species	Type
Black-tipped Reef Shark	Saltwater
Great Hammerhead Shark	Saltwater
Hawksbill Turtle	Saltwater
Blackspotted Puffer	Saltwater
Blue and Gold Fusilier	Saltwater
Longfin Batfish	Saltwater
Axolotl	Freshwater
Dolphinfish	Saltwater

What we're still waiting for

Full water-quality mechanics (filtration specs, biomes, compatibility) live in the in-game screens, not a shared Frontier list. Check the Aquarium How to Build page and each species' Zoopedia entry.