Weeping Willow will not open or extend

[KTTX]

Anyone can help me understand why these frags on ground will not open? It's been months and continue like what's in picture (barely open)

Parameters
Temp 78-80
Salinity 35 ppt
Calcium 440 - 450
Alkalinity 8 - 8.5
Phosphate .05 - .1
Nitrate 12-18
Magnesium 1360 - 1420


TIA

 

[shakacuz]

any other coral affected?

 

[KTTX]

No, just those 4 on sand. All other corals are fine

 

[Dbichler]

Try moving them higher up and into more flow and see what happens in a week.