I do 1 to 2 cubes a day, half in morning and half in evening, along with some seaweed extreme pellets in the morning. I have 16 fish, my biggest is a yellow tang and every thing else is smaller. 2 clowns, 2 clown gobies, a fire fish, a sand goby, a couple cardinals, 4 wrasses, a chromis , a RGB and a valentini puffer. Everyone is growing and happy.