My bowl is cycled. The bowl was born on 11/2012. Ammonia is zero and nitrates are zero. I'm just about ready to add some Cherry shrimp. How often do you change the water? My bowl is 2 gallons. Substrate is ADA Amazonia. I've been doing 50% water change every 7-10 days. Was wondering what your thoughts are on water changes for bowls. I'll continue to monitor water parameters after adding the shrimp.