Weekender Block 30g when placed in your aquarium will slowly disslove, releasing small particles of food and help stabilize pH. Break the Weekend Feeder Block into 4 small blocks. Each small block will feed 10-15 avaerage sized fish (3-4cm) for 2-4 days. For best results place block near an air stone or filter outlet to aid dispersion of food as block dissolves. Remove remainder of block when you return. For healthy fish, change aquarium water regularly and maintain water temperature of 22-27C with a pH value of 6.8-7.2.