Tap water to feed · hold on a fish to meet them. Tap coins and pearls to collect.
Buy your fish a friend!
Reef Shop
Grow your reef — deeper tanks mean wilder pests
Reef Keeper Guide
1Feed fishTap open water to drop food. Fed fish make coins and pearls over time.
2Collect rewardsTap coins, gems, and pearls before they drift away. Three pearls unlock the Helper Octopus and Guardian.
3Grow the reefOpen the shop to buy fish, food upgrades, helpers, and stronger eel zaps.
4Protect the tankTap threats to scare them off — eel, crab, sting-jelly, barracuda, spike urchin, gull, and ink octopus. Each has a tell; deeper reefs bring new pests.
5Meet your fishHold a finger on a fish to see its name and story. Rename friends anytime. Capture the reef with Postcard.