First of all, if you are afraid of doing water changes, your fish are dead meat. If you do not understand the basic principles of waste removal, why do you expect your fish to survive? Fish pee in the water all day (Ammonia). Certain bacteria eat it, producing nitrItes. Those bacteria in turn produce more waste, nitrAtes. Now you have to remove those nitrAtes constantly without killing the germs that keep your fish alive. It takes about six weeks to cycle a tank with fish. Supposedly a little less time if you use pure ammonia to kick-start the cycle.
What I have described is called the nitrogen cycle. Pet stores do not know what cycling is. They will tell you to run the tank for a day before adding fish. Then your fish die. THen you buy more fish. It's good for their business.
Google "nitrogen cycle aquarium". Petfish.net also has many good articles on this crucial aspect of fishkeeping.
Now do a little homework to help you and your fish.
And if you use the product called 'Cycle', how are your bacteria ever going to establish themselves? Stop using such products. They starve the germs trying to actually grow on your filter media.