cyphastrea coloration

Jason Scalise

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I have this growing cyphastrea (meteor shower type).
My question is about its coloration on the edges.
Compared to the central green part....the growing, encrusting edges are much darker or even 'browned'.
To be clear, I am not worried about it
as it is growing fine at a good rate, good PE, etc....but more curious as what variables are most likely leading to this and to see if I am thinking about it correctly....as I assume the leading edge of growth is not always 'browned'.
see pics and the short video...
admittedly this pic does not show much color difference but the edges are much darker/browner than the center.

Video link

Screenshot 2024-04-10 at 3.06.54 PM.png

relevant parameters are:
PAR 125-150
nitrate 6.0ppm
phosphate 0.1ppm
Ca 430
Mag 1350
dHk 7.5


thx
 
Last edited:

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