taiyo weeknd fish food when placed into the aquarium will immediately start to dissolve slowly releasing nutritious freeze dried foods in to the aquarium while at the same time neutralizing aquarium water one food block will be sufficient for an average then gallon aquarium for approximately 3 days the water temperature should be approximately 76 dgree 78 dgree 24 dgree 25 C as lower temperares retard the rate of dissolving while higher temperatures will accelerate the release of food particles highly alkline water will also cause the slower release of food particles therfore in order to avoid these difficulties 10% water change weekly is recommended water must be circulated by means of an air stone or filter in order to provide water circulation around the food block