Megaquarium Patch Notes: v5.0.X patches (Feb 25, 2026)

GamePatchNote Digest

Megaquarium Patch Notes — February 25, 2026

Aggregated from Steam, cross-tracked with Battle.net coverage on GamePatchNote.

Dear Curators,

All patches associated with the v5.0 release will be combined into this post to keep things tidy.

Tim Twice Circled

Fixed bug: Calcium Reactor was not available in 3. Sulasi in the Deep Freeze campaign.

Reduced requirement for Sandbox Trials - Species time trial to 70 species. Well done to everybody who already completed it, you did it on hard mode!
Improved mod update code to be slightly more resilient.

Translation: Words for 'Centerpiece' and 'Slushie' in Chinese changed to better fit meaning.
Translation: Words for 'Centerpiece' in German changed to better fit meaning.
Fixed bug: Button Polyps were getting unlocked incorrectly when a finite number were purchased or given as a gift.
Fixed bug: Mounted objects were getting double subtracted from the in-game count in the build menu, when the tank holding their parent object was sold.
Fixed bug: Floating plants could be put anywhere in magnifying tank - now they can only be placed at the back.
Fixed typo: Horseshoe crab description.
Graphics: Items on gift shop shelves and tool dispensers are now visible when picked up.

Fixed bug: Centerpiece and backdrop objectives were being generated even when Invertebrilliant Collection was disabled in Sandbox.
Fixed bug: When aquascaping is provided as part of an objective in Sandbox mode, it has to match the salinity of the animal.
Fixed bug: Octopus Custume was not spawning.

Fixed bug: Slushie machine refill cost was incorrect and final red slushie was not being purchased.
Fixed bug: Long-Spined Urchin was not being classed as an invertebrate for the Invertebrate Poster.
Fixed bug: Frozen Paint 3 was overridden by Underwater Paint 3.

Gameplay: Corals are now mounted on existing decorations.
Gameplay: You can prioritise tasks associated with specific items or skill levels on the advanced staff tab.
Gameplay: Calcium is now a hard requirement for some animals. Calcium Reactors need to be fixed with Calcium Refills when they break down.
Gameplay: Lights can go on any tank.
Gameplay: Rounded tanks cost slightly more, non-rounded tanks cost slightly less.
Gameplay: Backpacks double carrying capacity of more than just food now: gift shop, RO membrane refills and Calcium Refills are all compatible now.
Gameplay: Base game polish/rebalance.
Gameplay: Prestige is now earned for food/drink variety.
Gameplay: Copperband Butterfly is dangerous to Bivalves.
Gameplay: Outcrop tank max size is increased.
Gameplay: Arapaima can no longer eat Pacu.
Gameplay: You can build one-way gates underneath archways.
Gameplay: Reduced range of podium to 12.
Achievements: 2 new 'time trial' achievements have been added.
UI: Extra message log filters.
UI: Build menu remembers last position.
UI: Tank capacity icons shows an additional value for when all animals are 'grown up'.
UI: Added support for 'dangerous' tag in search.
UI: Added negative support in search using exclamation mark. e.g. "!dangerous" means animals which are NOT dangerous.
UI You can pick up multiple immobile objects at the same time now by right clicking on their portraits on a tank window.
Many, many bug fixes.