Do you mean Coulupra(sp?) algae???If so,,my answer is YES...I have it in a seperate 10 gallon tank under m,y main tank setup like a sump.This is called a refugium.It serves many purposes.It helps to reduce the nitrate levels in the tank.It gives the bad algae a prefered place to grow in the setup,thus kepping it from growing in the main tank.It provides fresh greens for my tangs to eat when I trim it.And by leaving the lights on over this tank 24hours a day,,It keeps the Ph stable....