here is a type of coralline algae (halimeda) that is common in the philippines ....most of it's weight is CaCO3 which is what coral sand is made of ... there are also numerous encrusting red algal species that also precipitate CaCO3 but they would not be confused with any type of green algae
another species of genus halimeda this one is called cactus algae and is also found in the philippines - it is also mostly CaCO3 by weight
I found the same picture as you on the internet but it is not the one i meen . Anyway , it looks atleast a bit like the one that is within the trade with the commercial fish exporters here in Manila It has the intention to "crumble down " in a reef tank .
cebu the picture on the left looks very much like what was at borocay but at borocay it looked darker in colour
Green algae in Boracay I first visited Boracay in 1976 when it was still a pristine place with only one building(a governor's mansion) in sight. There wasn't any algal bloom then. On my subsequent visits to Boracay, I have noticed the green algal bloom of Enteromorpha. I think the bloom is caused by pollution. You can find this green alga in abundance at the DC boulevard waters. Fishermen collect them to use as bait to catch siganids (balawis/dangit/Lo/Siganus)). Enteromorpha is edible and is a salad delicacy in the Ilocos and in Korea.
