You are doing a fish in cycle, which simply means there are fish in the tank while the filters develop the good bacteria that helps keep the water clean. It takes about 4-6 weeks for the filters to cycle (develop the good bacteria).
Reduce feeding to 2-3 times a week. Don't worry, the fish won't starve. After the tank has cycled you can feed more often.
Do a 75% water change and gravel clean the substrate 4-8 hours after feeding.
Monitor the ammonia and nitrite levels and do a 75% water change any day the ammonia or nitrite is above 0ppm, or the nitrate is above 20ppm.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.
After the tank has cycled, you can feed the fish every day if you like, and do a 75% water change and gravel clean the substrate once a week.