Definitely agree, at the moment I've made my fish food into ice cubes and I use ROwater to defrost the cube of food if I don't use the entire amount because of all the bacteria etc that's in the saltwater that can speed up the food spoilage. Maybe if used with RO water it may keep the food more clean? Just a thought also the tank water that suspends the food is at ~80 degrees so that should start the breakdown of food soonerGood question...Most likely there is some... but I keep the temperature around 30 F which would slows down the process...I change the food and rinse out the container every 5 days when in use ... no evidence of ammonia build up as of yet ... I am sure the food does not have the nutrition a fresh prepared batch does but maybe better then nothing