As long as you have that kind of stock and so little actual filtration its going to continue to degrade over time.
GFO in a HOB filter is going to do very little as it really needs to be fluid to do anything. And with the amounts recommended in a tank that size it will most likely be saturated in short order. It can only hold so much, same with carbon.
GFO in a HOB filter is going to do very little as it really needs to be fluid to do anything. And with the amounts recommended in a tank that size it will most likely be saturated in short order. It can only hold so much, same with carbon.