Bro,the rowaphos slip through the tiny holes to the base of the fr,not sure should i just buy something like the bio pellet type. At the moment i remove the black part which join at the output tube and increase the water flow.
Sis,I think the bros here are all trying to explain how important it's to perform water change.Somemore u are keeping corals.Performing water change also remove some of the fish shit etc. Just imagine the fishes living in their own shit unlike the ocean.