If you wish to do it properly, the main things are to have sufficient water /tank space available to rear the fry and also to have a special "line" or "type" of guppy that you wish to breed. Anyone can get a heap of mixed breed gravid female guppys and let them have thousands of babies. These would only be sold very cheaply as "feeder fish".
. The basic rules for keeping fish healthy are. 1 inch of fish needs at least 1 gallon of water (a Guppy is at least a 1.5 inch fish) Every tank must have a permanently running cycled filter. Every tank needs at least 50% of its water replaced every week. Baby fish should either have a constant supply of food or they should be fed every 3 to 4 hours in order to keep them growing rapidly.
the fishes need filtering every week or 2 weeks
The male will pursue the female relentlessly. You will need to provide shelter for her.
The best family fish is either a blue geromie, a betta, or a guppie, or a gold fish. None of these fish need a filter.
A mid-wife
there is a series of fish you can breed to get the magic fish. The frist magic fish comes when you first get the game then breed a bunch of fish together untl you get the rest
The eggs doesn't have this fish,you need to breed it
To get the angel fish, you need to breed unicorn fish and fairy fish together
Firstly, you need to have a clean environment, secondly you need to freed the caviar daily for nutrition to let the caviar eggs breed and grow, thirdly you need to change your water tank every three days to avoid any pollution within the water surfaces, Then when your fish finally hatch you can feed it regular fish food.
You don't need one to breed and i don't think you do to sell.
It depends on the breed, you will need to be more specific.
No. You need one of each.
Because they are easy to breed. some people like the way they look. and some people need a food source for their larger meat eating fish