Acro changing color cause or problem?

[George Villasenor]

The green acro I got is turning purple slowly after a week in the tank.

Parameters:
Calcium - 400ppm [API]
Phosphate - 0ppm [API]
Alkalinity - [API Test] 11dKH [Hanna Check] 9.5dKH Average 10dKH?
Nitrate - 0.1ppm [API]
Magnesium - 1440 to 1470 ppm [Salifert]
8.1pH

The LFS gave me the Acro and I texted them, they say it's coloring up but I need input from the community, just to be safe... I also do not have fish, only coral and the acro is the only SPS in the tank that's isolated from every other coral (Whole plateau to itself.) I also have BRS Kalkwasser in my ATO.

 

[Robink]

Purple is ok, if it's supposed to be purple, brown is not. You need some nutrients in your water or the coral will starve. I would add some fish.

 

[jda]

API test kits are not reliable enough to make any decisions and certainly take any action. If you are not using any GFO, organic carbon, or the like, then your nutrient levels are fine. As stuff grows, you might need to add some.

Look to growth and encrusting for positive signs. Purple is a more advanced color than green, so this is a good sign.

 

[George Villasenor]

API test kits are not reliable enough to make any decisions and certainly take any action. If you are not using any GFO, organic carbon, or the like, then your nutrient levels are fine. As stuff grows, you might need to add some.

Look to growth and encrusting for positive signs. Purple is a more advanced color than green, so this is a good sign.

I do feed my corals or at least the LPS directly with reef roids, the extra gets broadcasted.

 

[jda]

There is no chance that there are not enough nutrients unless you are using media or chemicals to bring them down. I would not sweat this unless you are using media and chemicals.