This fixture has 72 3w led from rapidled. I combined 3 16" heatsinks to make this 48" fixture when its done i will post more pics. Running out of money fast lol!!!!!! The sump is a 40 gal tub i purchased from tractor supply. The milk crate u see in the pic is covered with screen this will hold my macro algae. The screen will prevent any loose pieces from making their way into one of my pumps or the tank itself. If anyone has experience with this problem u know the frustration of cleaning it out and how fast it reoccurs. Im going to install some type of pump or power head to give the algae some flow and hopefully it will tumble. I hear this is the best way to grow cheto.