What the aquarium is for
Your aquarium near the SafeZone stores hatched fish, grows placed eggs, and shows coin income. The fish panel appears when you are near your own aquarium. Each card can show name, age, weight, EXP, and a Coins/s label. Recorded counts include 2/5 early and 5/5 after more hatches, with Mackerel, Clownfish, and Sea Tilapia visible together in one 5/5 view. Another session placed a fish in a sixth position, and another described six fish in a full tank, so five is not a proven cap.
One player read in-game text that the tank holds 5 fish and seemed to require a rebirth for one more slot. That is one reading of one moment. An Italian game listing says the bay can be upgraded to hold more fish and does not say how. The Aquarium Shop skins that were recorded do not advertise slots. The equipment stall sold radars. No capacity purchase was completed on camera, and no recording shows what happens if you hatch while the panel is full.
Unequip frees a visible slot by moving that fish to inventory. It does not delete the fish.
Coins come from fish cards, not a claim button
The tutorial says aquarium fish produce Coins over time. Each card shows a Coins/s label. Examples from single fish, not species rates: a Clownfish at 500 per second, a boxfish at 1,000 per second, a seahorse at 3,440 per second, a check around 7,000, and a player who said a mutated Kraken was their top earner. Balances seen mid-session include about 11 million and about 900 million Coins while playing. No recording shows a collect button or income while the player is away. An AFK plan is an expectation, not a demonstrated payout.
Do not convert weight, EXP, or occupancy into speed or into a species income chart. Coins/s is also not a ride-speed stat.
Verified Coin spending is the Equipment Shop radar menu. One snapshot listed Basic Radar at 1,000 Coins (3 in stock, label 5 min - 1 use) and Improved Radar at 8,000 Coins (2 in stock). Recheck the live row. Food is bought at its own stall in repeated sessions, but no recording clearly prices food in Coins. One remark, "eat up, 100," could be a price or a quantity. Aquarium designs are priced in Tokens, not Coins.
Two recordings show a coin on the seabed. Neither shows what picking it up pays. Players mention selling fish. No completed sale with a payout was recorded.
Feed for a named EXP result
Feed is the green row button. You need food in inventory. The tutorial can give fish food and fish flakes. Otherwise use the food stall, which can be out of stock. One player could not buy because stock was gone, then later saw radar stock return and turned on auto-buy.
- Note that fish's EXP and age.
- Press Feed on that row. No feed hotkey was captured. E is used for eggs in the PC recordings.
- Read the notice. One feed said +1,000 EXP on a named Snapper.
- Food count can hit zero mid-feed. Go back to the stall.
A golden-pellet story took a baby fish to level 56, and players have read ages such as 2 years and a manta at age 28. Those are single sessions. Whether Feed has a cooldown is unresolved: one player asked if a fish can be fed again, while others fed repeatedly. Watch the food count.
Feeding is documented as growth. Players also narrate speed and income gains, including a manta speed readout moving from 125 to 251 and later 436, and a Kraken said to reach 1,000,000 speed from food. Those are not controlled tests. One session also guessed that bumping into things lowers speed until it recovers. Measure your own card before you rearrange the tank for income.
To test one fish: write down Coins/s, EXP, and age, feed once, confirm the named notice, then reread Coins/s over a short stretch of play. An EXP jump does not prove a formula.