ALL algae do not need darkness to grow. Otherwise, owners of swimming pools or fish ponds would not need to add algicides. Some algae does grow well in the dark. Unilever may have made the best choice for them, but anyone who knows even the slightest amount about algae growth knows that there are many MANY different algae species. Each species has an individual requirements for growth. There seems to be an obvious agenda here to tell only partial truth biased to make it look like BEHL is incompetent. Knowing a bit about algae, that is clearly not true. BEHL is not the incompetent party here.