I'm still struggling with low Barium levels, can't keep the consumption and dosing correct right now, due to the fact of Barium can only be tested via ICP :-(
If you look at the coral right of the BC Trobairitz at 3 o'clock, you can see how the Coralline algae made a success inside the coral tissue and competed it out! That happens as one of the indicators when I have extreme low Barium levels ( @ 2 microgram/L).
So I have lifted Ba and dose now daily Barium, while waiting for another test result to proof my theory and other signs of low Barium effect. If Ba is being supplemented and stable for a while, the coral will take over again very quickly.