Hi sachin,
I'm afraid you've got more problems than just the CAE unfortunately.
Those goldfish simply do not belong in that bowl I'm sorry. One goldfish needs 20g (80L) and each one after that needs 10g so for three to live by themselves you need a 150L tank minimum. Goldfish are messy creatures and require high filtration 10x the tanks volume an hour.
I really strongly advise you return ALL of those fish and buy something more appropriate for your tank like a Betta.
Those goldfish will not live a full life in that bowl and keeping their water clean will be next to impossible.
Here is a link that explains tank and fish care and the nitrogen cycle. Cycling a tank is VERY IMPORTANT.
http://www.aquariumadvice.com/forums/f15/guide-to-starting-a-freshwater-aquarium-186089.html
Please if you have any questions don't be afraid to ask! We are hear help you and your fish.