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ARC AquariumNewsARC Aquarium 2.5: Halloween Festival
Major update

ARC Aquarium 2.5: Halloween Festival

ARC Aquarium · published 10 Oct 2026, 13:41 UTC · build 25850213

All newsPlayers around this dateRead on Steam

Happy Halloween! Version 2.5 brings a limited-time Halloween Festival and a big round of changes you asked for. Your gold, cards and tanks are all kept, and there is nothing you need to do.

Halloween Festival (until January 7)

  • Open the festival with the new pumpkin button in the bottom bar.
  • Earn candy by caring for your fish: every hungry fish you feed by hand gives +1 candy (up to 10 per tank each feeding), and cleaning the glass with the sponge gives +5 to +20.
  • Trade candy for five animated decorations: the Jack-o'-Lantern flickers and giggles, the Ghostly Tombstone has a little ghost floating above it, the Witch's Cauldron bubbles and steams, the Haunted Tree sways while something blinks inside its hollow, and the Haunted Castle has waving flags, candle-lit windows and a bat circling its towers.
  • They glow beautifully at night. Try the moon button!
  • The festival decorations can only be traded for until January 7. The ones you get are yours to keep.

See the rarity of every fish

  • Fish windows now use the same colors as the cards: gray Common, blue Rare, purple Epic and gold Legendary.
  • Plant and coral windows use the same colors too.

A new fish slot at every level

  • Every player level now adds one fish slot to each of your tanks, up to 100 fish per tank.
  • If you are already at a high level, your tanks have grown the moment you start the game.
  • Tank upgrades still raise the base fish limit and the decoration limit.

Care gives EXP

  • Feeding hungry fish by hand now gives EXP.
  • Cleaning the glass with the sponge gives more EXP, growing with your level.

New: auto-cleaner

  • Buy an auto-cleaner for any tank in Store > Tanks, for 7 or 30 days. While it runs, the glass stays clean.
  • A black internal filter appears on the side glass and sprays a stream of bubbles that drift up and fade away.
  • The auto-feeder and the auto-cleaner are now priced by the size of the tank, so they are affordable from your first level. A clock icon on the tank card shows when they are running.

Economy rebalance

  • All rarities now earn almost the same gold per hour (2 to 2.6 per fish). Rarity is about collecting, not about income, and lucky pulls no longer snowball.
  • Epic and Legendary cards are a little rarer in packs and decks, so the collection lasts longer.
  • Cure prices are lower for rare fish.

Smaller eyes and fixes

  • Fish keep their round bodies, but their eyes are back to their original, smaller size.
  • Fixed a rare error on the loading screen when entering the game.

🐞 Found a bug? Please tell us in the Steam Discussions. We read every report, and most issues can be fixed right away.

More from ARC Aquarium

Other announcements

All news
In-game event14 Oct 2026ARC Aquarium 2.5.1: Merge and Feeding FixesThank you for the reports! Version 2.5.1 fixes the two problems you told us about. Your fish, cards and gold are all safe, and there is nothing you need to do. "My merged fish disappeared" No fish were deleted. Every merged copy was added to another fish of the same kind. The game just did a bad job of showing you where it went. Two things made merging look like cards were vanishing: · Merge al…In-game event8 Oct 2026ARC Aquarium 2.4: Steam LeaderboardsThank you for playing ARC Aquarium! Version 2.4 adds Steam leaderboards, so you can finally see how your aquarium compares with other players. Your gold, cards and tanks are all kept, and there is nothing you need to do. Example leaderboard with sample players. Three leaderboards · Collection: every species, plant and coral you have found in your collection book. · Level: your player level. · P…In-game event7 Oct 2026ARC Aquarium 2.3: Brand-New Fish & Plant ArtThank you for playing ARC Aquarium! Many of you told us you loved the bright, colorful look of the original art. Version 2.3 brings that look back to every fish, plant and coral in the game. Your gold, cards, tanks and decorations are all kept, and there is nothing you need to do. Every fish redrawn · All 125 fish have new art: rounder bodies, big friendly eyes, visible scales, bolder outlines…