Turning a hobby into a business - Selling aquarium fish

When I was young, maybe around 14 years of age, my main hobby was fresh water aquaria. I knew almost everything there is to know about most species of aquarium fish.
At my peak, I had 5 freshwater tanks, all populated with fresh water tropic fish of more than 20 species.



I soon started to learn how to breed them and in no time I start producing excess offspring that I would sell to local pets stores. I sold them in bulk, around 100 fish at once at half the market price of even lower. I even sold them to my relatives and friends.

Now the easiest freshwater fish to breed are the Viviparous category (Poeciliidae family), the ones that give birth to live young! You just need to make sure the water has the right temperature, PH level and it isn't crowded enough, you'll have to monitor the females and separate them once they are close to giving birth.

Here are the species I used to breed without any problems:

swordtails - they need a good sized aquarium but breeding them is easy once you have a couple of right pairs, probably the one with most breeding problems, at least for me.

• Platies - easy to breed, similar needs at the swordtails.
  
• Mollies - cute and easy to breed, I used to mix them with Platies, the offspring were usually infertile but looked cool
  
• Guppies - the easiest to breed fish of all time! At one point I wasn't separating the females anymore because the young found a way to survive (well most of them). Buying just a few pairs will ensure doze and doze of young in a few weeks time.
  

So there you have it! Have you ever thought about turning a profit around from selling aquarium fish?