Help with Red Montipora Digitata

[PanchoG]

I hope someone can give an advice with a red montipora digitata I bought 6 months ago.

When I bought it in the LFS it was its red was intense, I placed in the bottom of my RSM-500 to avoid burn it with the HD Hydras. But it does not matter if I place it in the light or the shadow, if I increase or decrease the lights, the thing does not grow or die nor gets its color back.

My water parameters I believe are good but not perfect, I test the water every two weeks at least and make monthly water changes (1/5 of the total volume):

Ca = 420
Mg = 1600
KH = 10.4
NO2 = 0.1
NO3 = 0
pH = 8.0

The lights are Hydras HD, working on these sets:

Any advise will be appreciated!!!

 

[Crabs McJones]

I hope someone can give an advice with a red montipora digitata I bought 6 months ago.

When I bought it in the LFS it was its red was intense, I placed in the bottom of my RSM-500 to avoid burn it with the HD Hydras. But it does not matter if I place it in the light or the shadow, if I increase or decrease the lights, the thing does not grow or die nor gets its color back.

My water parameters I believe are good but not perfect, I test the water every two weeks at least and make monthly water changes (1/5 of the total volume):

Ca = 420
Mg = 1600
KH = 10.4
NO2 = 0.1
NO3 = 0
pH = 8.0

The lights are Hydras HD, working on these sets:

Any advise will be appreciated!!!

How tall is your tank and how far off of the water surface are the hydras

 

[PanchoG]

The tank is 28” and the hydras are 8” above the surface, it is a RSM-500

 

[Jeepguy242]

mg and dkh are high

 

[PanchoG]

Mg is a little high but KH is right were it must be as the range is between 8 - 12

 

[PanchoG]

I want to clarify all the other corals are doing good, duncans, acans, setosa, hammer, torch, zoas, other montiporas, etc. It is just this particular one....