For successful breeding you require a healthy pair of angel fish.But before spawning it is very difficult to decide which one is male and which one is female.Until you look them at the time of spawning while watching female laying eggs and male fertilizing them and noticing their size of papilla .Male's papilla is small while females papilla is wide and blunt.
So you need a pair of angel fish.
The best way to do it is get 8-10 young angel fish and put them in 50 gallon tank.The height of tank should be about 18 inches.When they get their size of about 1.5-2 inches in diameter or at a age of 1 year, they will pair off themselves,and they will select a territory and chase other fish way.This is a sign that pair is formed now move this pair to separate tank.From a group of 10 you may get 3-4 pairs.
You may need about 20 gallon tank and 18 inches high.Maintain regular water changes.The water temperature of angel fish should be kept between 80 - 85 degree F( 27 to 29 degree Celsius) .Give them good quality of food rich of protein like daphinia,beef heart brine shrimps, mosquito larvae etc.Five minute of feeding is enough. If food is left even after 5 minute then remove it.If female become aggressive and having bulging belly then she may be carrying eggs.To angel fish grooming each other is also a sign that they are going to spawn .Before spawning they show their papilla .Papilla is a Small pink organ present near their anal fin.They also lock their lips and twist around.When they are ready they choose a site to lay eggs which may be any flat surface or broad leaves of aquarium plants and they will star it cleaning.You can put spawning slate so they lay eggs.
Now the female will deposit eggs on the slate or at any other place such as plant's leaves.The male angelfish will fertilize them by touching eggs with its papilla.If their is no male present then other female may do the same but this will not result is fertilization and soon eggs will turn white.
After fertilization
If their are other fishes also in the same tank then they may eat the eggs during the night.However the pair of angelfish tries to protect their eggs.So you must replace other fishes from the tank where angelfish pair is present or you should have put pair in separate tank before spawning.Sometimes it is also observed that parents may eat their eggs and sometimes they protect.So you must take a note on that.You can put a spawning slate,or piece of marble,or smooth tile.This will help to move the eggs to separate tank.You can put a pot in tank then move slate or eggs to that pot without taking out them of water. Because eggs may not survive on air exposure.Now move that pot counting water and eggs from tank to another tank.
After about 48 hrs eggs will start showing fry tails.On third day you can see their yolk sacks.These will be still attached to the slate or leaf.If the parents are in still in the same tank they may start moving small fry.After a week you will find them swimming freely now they will need food.
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