Base outline of sps fluorescing

[ReefHunter006]

Anyone know what it signals when the perimeter of the base on sps start to fluoresce bright green? I used the picture below because it provided the best color contrast of what I am seeing, but it’s a smaller frag so it doesn’t show how localized to the outer perimeter the fluorescing actually is.

This phenomenon is happening on 3 frags. When I first looked at the frag below I thought that’s just light angles, but then I noticed it on frags that were expanding out their base in about 3 inch radius and it was just the outer edge fluorescing. I started to shift the frag around and it didn’t change, so I started to investigate others.

The three frags that this is happening to are different colors (red, green, yellow/blue). There are maybe 50+ Sps frags in the system, but I only see this in 3 frags for roughly a month.

I know color changes like this in the wild have been connected to environmental stress, so I am concerned this might be an indicator of something happening.

 

[shakacuz]

just seems like regular growth to me. i have a PC rainbow that’s super bright around the base. as long as your water parameters are in line i wouldn’t worry

 

[SPS2020]

Yep, all of mine seem to do the same.

 

[ScottB]

It varies by species, but is very common among the acros I keep -- tenuis in particular.