Ricordia fading colors

[Krzydmnd]

Hi all! These ricordia were my first Corals and have always done really well in various locations in my tanks over the past year and a half. Recently they are starting to get a slightly milky coloring to them. I haven't messed with my lighting or moved them in months. I don't know if it's a lighting issue, (too bright or too dim) but they're sitting around 100 par in medium flow.

Anyone have any ideas on why this happens and any idea what causes it?

 

[DSC reef]

I can't imagine its lighting unless a spectrum shift? Any changes or swings in chemistry?

 

[Crabs McJones]

Any changes in water parameters?

 

[Krzydmnd]

The only issue I've had was an alk spike about a month ago. I typically run at 9 and it was up to 14 before I caught it. My sps suffered pretty heavily but I didn't notice much reaction from Lps or softies (of which my softies are all mushrooms) unless this is a reaction from that spike

 

[DSC reef]

I'm betting on the alk spike seeing that the coral has been under the same light for a while. I think they will recover though. Some LPS can be good indicators of chemistry swings while others can take some time to show the effects.