This is a can marine pond of a American who lives down the road from me,It works on a open system sea water is pumped in and flows through the system and then returns to the sea.He pumps water from a depth of 12m thats about 25m from his house.The pond is about 10x5m and about half a meter deep.The coral groth he has is just amasing,
View attachment 50781
View attachment 50781