Purigen is a synthetic carbon a good one mind you but it will not likly improve you phosphate problem. I might aid in your Nitrate but you don't appear to have an issue there.
The purigen is too small for sure I ran it for a long time and had to buy the very expensive "The Bag"
If you completely cut off the food source for the Anthelia will you not also be cutting off the food source for all your other Soft corals?
J
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