Because it's just too boring to buy and sell many tanks of White Grunts every day to generate coins. The Altum Angel is more expensive but makes about the same daily profit and matures in three days, saving a lot of work. And did I mention, it's pretty?
But who knows how much money you already have. So here are some options (under level 65):
What you can buy with 2,500,000 coins
(How long it takes and how much it sells for, sold individually and including 20% happiness bonus)
1 Pink Skunk Clown - 5 days - 3,150,000
71 Altum Angels - 3 days - 3,101,280
595 White Grunts - 1 day - 4,198,320 (approx. 12 tanks - happy tapping!)
sold in bulk: 3,568,572
2 Narrow Lined Puffers – 3 days – 2,995,200 + 8 Altum Angels
(bought from leftover)=3,344,640!
1 Borbonius Anthias - 3 days - 1,819,800
(1,000,000 leftover. Bad example for this one,
we're not quite rich enough to make it look as good as it is.)
5 Royal Gramma - 3 days - 1,872,000
* * *
This knowledge should get you to a level where coins are not really an issue anymore. So the next question is: Which fish generates the most money per day, individually?
Price | Selling Price | Final Selling price incl. bonus (sold individually) | Profit | Days | Profit per day | |
Pink Skunk Clown (Limited Time C.) | 2,500,000 | 2,625,000 | 3,150,000 | 650,000 | 5 | 130,000 |
Borbonius Anthias (Super Exotic) | 1,500,000 | 1,516,500 | 1,819,800 | 319,800 | 3 | 106,600 |
Narrow Lined Puffer (Limited Time C.) | 1,200,000 | 1,248,000 | 1,497,600 | 297,600 | 3 | 99,200 |
Royal Gramma (Limited Time C.) | 500,000 | 520,000 | 624,000 | 124,000 | 3 | 41,333 |
Spotted Cardinalfish & Banggai Cardinalfish (Super Exotic) | 800,000 | 808,000 | 969,600 | 169,600 | 5 | 33,920 |
Altum Angel (Limited Time C.) | 35,000 | 36,400 | 43,680 | 8,680 | 3 | 2,893 |
White Grunt (Super Exotic) | 4,200 | 5,880 | 7,056 | 2,856 | 1 | 2,856 |
Mummy Fish (Limited Time C.) | 35,000 | 40,250 | 48,300 | 13,200 | 5 | 2,640 |
I don't know if this chart is complete with the best fish (under high level) but it should give you some idea. Also, hope it's correct, haven't double-checked.
Happy tapping and please comment!