Duncan coral receding help

[ItzOnlySmellz]

Hello,
My healthy duncan has had a couple of heads suck in and turn white... what have i done?
No brown jelly I can see, no changes I can list.
Tank is stable. Pic taken at night with just whites, normally all open apart from few around 2 white ones.

350L tank 1+yr
Amm 0
Nitrate 18
Phos 0.2
Alk 9
Cal 450
Mag 1350

 

[Gumbies R Us]

Any recent changes?
Lighting and flow?

 

[ItzOnlySmellz]

Honestly flow dropped a bit. But still adequate

 

[ItzOnlySmellz]

Lighting same

 

[Gumbies R Us]

Have you started dosing anything new?

Anything that could be bothering it?

Introduced anything new to your tank?

 

[ItzOnlySmellz]

Started using reef roids 3 weeks ago. Used once a week. Have added fritzzyme 9 a week ago after water change. Everything else the same

 

[ItzOnlySmellz]

Hmm, this morning there is some brown gunk on the effected heads. Just normal from the die off, or does that look like brown jelly?

 

[ItzOnlySmellz]

So I've done a dip, cleaned alot of gunk out and there was a fair bit of slime at base of coral( unsure if that's normal).
Only thing I noticed are a few of these.... could these be the problem? Never seen it before. They are attached at the dying section and other parts of the coral.
TIA

 

[ILOVEYOUHALFISH]

I’m not expert but maybe some type of eggs ??

 

[mcarroll]

Honestly flow dropped a bit. But still adequate

Lighting same

Lighting and flow have both dropped a bit? Why?

Lighting changes and flow changes are often not well tolerated.

Started using reef roids 3 weeks ago. Used once a week. Have added fritzzyme 9 a week ago after water change. Everything else the same

Worth laying off both of them since the timing lines up. Broadcast feeding will end up causing an algae outbreak anyway.

Hmm, this morning there is some brown gunk on the effected heads. Just normal from the die off, or does that look like brown jelly?

Normal.

So I've done a dip, cleaned alot of gunk out and there was a fair bit of slime at base of coral( unsure if that's normal).
Only thing I noticed are a few of these.... could these be the problem? Never seen it before. They are attached at the dying section and other parts of the coral.
TIA

Looks like a new head budding out. Is it loose or can you scrape it off? If not, then what I said.

Taking corals out of the water is VERY stressful, BTW. I would not repeat this.

 

[ItzOnlySmellz]

Flow was backed off as not battling with cyano as much and got a better sway now with it lowered. Lights the same.
Tried picking at it, but didn't budge so left alone.
Reef roids feeding was targeted, not broadcast, but will hold off and monitor. Other heads around 2 white stalks do look irritated too but not as bad yet. Seems to have happened quick.
Photo from just now

 

[mcarroll]

As dense branchy corals like this grow, they need VERY strong water flow or parts of the colony end up with crappy flow (blocked by the colony itself), which will eventually cause mortality to affected parts of the colony.

Your numbers seem good. IMO consider restoring the pre-existing stronger flow conditions, or otherwise improving flow to this coral to see how it responds.....keeping in mind that it was just de-tanked and chemical-dipped, of course.

I'm on the fence about the change in lighting....seems like lowering the lights would be less of a problem, but lighting changes in general aren't good. IMO don't do anything until the jury is in on any improvements from the flow change.

 

[ItzOnlySmellz]

Thankyou for everyone's input.
So I have increased flow maybe half way between what it was and before to see how it goes. Seemed a bit high at best of times but seemed to help with cyano. Thought more of the colony would suffer if flow was the issue but if it works, i'm a happy camper.