Welcome!
For running/operating a fish shop, fish issues,
@Colin_T is the most qualified to advise you.
There are also others who have many years of experience who can advise you about fish/fish species.
But before you start a business, you may want to do a survey of your place...
Are there many young people who are willing to keep pets?
Keeping fish are not cheap.
So, you may want to find out the purchasing power of the people who live in your area.
You may want to promote/advertise and provide awareness to people in your area about fish keeping...
Calculate your operation costs, profits, etc..
Look for reliable and cheaper sources of fish from your country or overseas and get their support.
You will need to get support from them and learn more about how to keep the fish
Provide as much information as possible to get people interested in fish keeping through the media, brochures, etc..
Knowing about the fish, shrimps, lobster/crayfish, crabs, their background, origin, behaviors, etc will get people interested in them...
Provide information about the different rivers system in the world...
South America - Amazon, Orinoco, Pantanal, Negro rivers, etc...
Africa - Lake Malawi, Tanganyika, Victoria, etc.
Asian, Australian, Central America, North America rivers,...many more.
You can also promote aquascaping to attract people.
Get someone to do some road shows to promote aquascaping...
Read as much as possible from reliable sources about the fish, shrimps, crabs, lobsters species, etc...
Seriously Fish website provides reliable information about fish.
www.seriouslyfish.com
You will need to know all about the fish requirements - water pH, GH, KH; starting a tank, tank setup and
especially Ammonia, Nitrite and Nitrate issues, fish diseases, and many more...
Find out what are the fish that are commonly bought by most people (eg. Guppies, Neon Tetras, etc). Focus on these fish.
Whenever you sell fish, you must also sell other stuff like fish tanks, fish food, filters, accessories, water conditioners, medications, sand, rocks, driftwoods, lightings, etc.. to support the fish keeping hobby...
Sometimes I feel that if you carry many "affordable" tanks, more people will buy them and in return, they will buy more fish...
Don't carry too many high end products that will turn people away from buying them because of their prices...
Asian/Chinese brands products are a few times cheaper than the American/European brands...
Also, don't carry too many expensive fish or fish that are not hardy. You will lose money when the fish die...
In fact, I saw some fish shops that carry only cheaper fish and only 1-2 types of expensive fish...
I'm not a businessman but I visit fish shops almost every week, and sometimes almost everyday and I observed which shops have more customers and what the customers buy most of the time... There are more than 10 fish shops near to my house, or within 15-20mins drive away...
Let us know if you have more questions especially about the brands of products, fish food, etc....
Some links which you might be interested...
biotopeaquariumproject.com
Getting started with aquascaping is not difficult. Like any other passion, it takes time, dedication and extensive research.
aquascapinglove.com
Written by: Tammy (@aquarist_tl) and Team Buce Plant When most people think of aquariums, they expect to find fish living in them, but there is actually a vast amount of hobbyists that maintain shrimp-only tanks. There are also those that have tanks with both shrimp and fish cohabitating with...
buceplant.com