[Willow]

macro algae is not a silver bullet for cleaning up tank problems, it's all about balance. when you tank is in check with it's parameters and your nuisance algae is under control the macro algae will steadily grow provided the conditions are right. you may need to mess around with the right kind of algae is right for your system and what light periods work best but it will grow eventually. try and find yourself some cheato and get rid of the grape, when it does grow it will be a pain the in the ass whereas cheato just grows in a nice manageable ball and wont go sexual.