some problems with acropora

I have different stonecorals like acropora , stylopora, goniopora, caulastrea…all doing well exept de acropora’s especial the light blue topped ones….. what can be the course of that?

all the watervalues are right….

KH 8
PH 8,3
salitinity 1,025
Temp:26°C
calcium 450
Magnesium 1350
Phosphate O mg
Nitrate <12,5 mg

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some problems with acropora

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