While I have found that at the start if you get A Silky Spotus, Twin-Fin Shark, Orange Fruitfish, Greenfin Spotus (wich is magic) you can get it in your first set of fish most times. Also Silky Stickfish and some sort of Fatfish. You can get a few fish that are worth $25-$40 and if you dont buy anything except medicine if needed then you will quickly get enough money to upgrade to the next level for the Fish Enviroment. Then you can keep those new fish you have gotten Alive long enough to breed. After you get the upgrade get and Airfilter from the Supply shop and then the food Upgrade and then save for the next enviorment upgrade. So here are a Few Combos:

Silky Spotus & Twin-fin Shark = Golden Glub Price@ $40-45

Orange FruitFish & Silky Spotus = Pink Leaffish pice @ 20-25

Greenfin Spotus & Twin-fin Shark = Flagged Glub pice@ 25-30

Thats all I have for now I will update this as I have more if anyone has any other eaisy combos to get fish that can get decent money please feel free to post.

Ok I have also found this is a great way to get another magic fish. If you Buy a set of the common Eggs in the shop you can get a Spined Fruit Fish. When that happens Breed:

Spined FruitFish & Greenfin Spotanus and get = Magic Speckles Leafish.
Sell this for $75-80 and wow you beed those fish and get a full tank to sell then buy your secound tank and you can breed more of the Magic Lea until you find another fish worth good money. I will update again when I have more. Please post and let me know if this has been helpful.

You can also sell the Magic Speckles Leaffish for $100...

OOOHHHH I found something cool:
Breed your Golden Goldbulb & the LeaFish and you get a Spined Stick Fish. Then Breed the Spined Stick Fish and the GoldenGoldBulb and Get Magic CRIMSON COMET. You must have the final Enviorment in order for this fish to stay alive.

Ok well I ment breed the GoldenGoldbulb and the SpeckledLeafish to get the Spined Stick Fish.

Next thing I just came across. I found a Hornet arrowfish in one of the sets of cheap eggs I bought and I was messing around and found a new combo to get to the Money Fish.

Hornet Arrowfish & Spined StickFish = the Magic Guppy Canary Fire-Arrow. Wow I am selling it for $350.00 Now after I make some money I will go after the other magic fish.
The Combo I just explained is not on any of the Threads I have found for magic fish so I think I found a newer and easier way to get that fish.