Duncan Coral Turning Brown Rapidly

Toasteh

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Hey guys.

My Duncan coral was perfectly fine yesterday. When I came home today it had closed up. Within a few hours it had turned brown and was beginning to lose it’s flesh. The brown spots continue to spread
rapidly. It appears that one of my Cespitularia’s is also starting to turn brown.

Duncan today:


Tank yesterday:


Parameters:


Some backstory to what’s been going on in my tank:

4/4: Removed Chemipure and started Fluncanzole treatment
4/18: 50% water change
4/14-4/22 Massive cyano outbreak.
4/19 2 gallon water change to suck up cyano
4/21 Chemiclean treatment. Removed Chemipure, added airstone
4/23 4 gallon water change, removed air stone

Other considerations: Alk was high at 13.3 prior to 4/4 Flucanzole treatment due to dosing reef buffer to raise pH (stopped). Alk has since normalized after stopping dosing and performing water changes.

Anyone have any idea of what to do and what might be causing my Duncan to deteriorate so rapidly?
 

Tuan’s Reef

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Tank age?
Other water parameters ?

Alk is a bit high . I would avoid using the ph buffer as I have heard they are more trouble than they are worth.

My ph bounces around from 7.8 to 8.2 daily without any issues to fish or corals. I open a windows to increase ph in the morning.
 

vetteguy53081

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Chemi clean probably ticked it off. Duncans do Best mid tank under moderate to gentle high flow under blues with 20% white and blue at 75-80% AND FEED. They do eat
 

Form or function: Do you consider your rock work to be art or the platform for your coral?

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