There used to be larger package available that had better price to weigh ratio, it seems to be gone now.
What I observed when I used Reef Actif number of years back is that overall the tank looked better, corals looked open and fluffy. Once I run out or Reef Actif the corals did not look as good.
Reef Actif may have played a role or not, I was mainly using TM products at the time. I am slowly migrating back to TM products and Hans Werner way of reef keeping, I used to be stressed less, things seemed easier and I didn’t have mysterious coral deaths.
Just a suggestion maybe stop using Reef Actif for a month or three and see if things improve, stay same or degrade.
It is carbon source so other carbon sources may provide same benefits…