I've noticed that too Katana, but I thought that was more starchy vegetables that were the culprit...like potato and pumpkin, which I don't feed any longer because any longer it makes the water cloudy. 0 ppm of ammonia and nitrite, just cloudy water almost like what you get during a bacterial bloom. Clears up in a bit though, as you say.
Interestingly, corn doesn't seem to cause any problem - I've sometimes fed my goldfish kernels of fresh corn.
Interestingly, corn doesn't seem to cause any problem - I've sometimes fed my goldfish kernels of fresh corn.