Very old Ducan now opening only half? Why?

[daniel_mourra]

Ive had this duncan for about 2 years now. Its always been opening up great and always in the same tank spot. But about 3-4 weeks ago, only half of it opens as usual, the other half refuses to open. Any idea why only half my coral is opening? I have never moved it. NO changes to light or flow in the last 12 months…. NO NEW FISH OR INVERTEBRATES in the last 8-10 months.

Water parameters are:

Salinity 1.022 three weeks ago; brought it up to 1.025 in 3 weeks. Now 1.024.

Dkh: 8.4-8.5 very very steady.

Ca: 420-440 steady.

Mg: 1500 (went up due to bringing salinity up. Now in the process of going down. Now at 1480).

Nitrates: 5ppm very very very steady.

Phosphate: 0.15 steady.

Temp: 25.5 C (78F)

Par: 120-180 in that spot. Its always thrive in there.

 

[mcarroll]

Salinity 1.022 three weeks ago; brought it up to 1.025 in 3 weeks. Now 1.024.

Off the top I'd have to say this at least relates to the cause....was the salinity drop a mystery or do you know what happened?

Its always thrive in there.

It looks like the downstream side of the coral is what's closed...maybe consider a flow rearrange or maybe even adding a pump?

 

[daniel_mourra]

Off the top I'd have to say this at least relates to the cause....was the salinity drop a mystery or do you know what happened?


It looks like the downstream side of the coral is what's closed...maybe consider a flow rearrange or maybe even adding a pump?

Yes i know the cause. I use chris meckleys kalkwasser method which adds alot of kalkwasser (more than evap) so it drops salinity if i am not vigilant. Every week it goes from 1.026 to 1.025 in 7 days and then i do a water change and bring it back up to 1.026 as i change with new “saltier water”.

 

[Piotrek]

Not 100% sure, but might be flow or light related due to coral growing. Maybe the closed side isn't getting enough light anymore due to the other side covering it?

 

[Jimbo327]

How often do you do water change? And how much water do you change?

 

[Mr. Mojo Rising]

Whats on the side of the closed duncan, is something maybe stinging it?

 

[daniel_mourra]

Not 100% sure, but might be flow or light related due to coral growing. Maybe the closed side isn't getting enough light anymore due to the other side covering it?

Aparently not because the closed side is actually more towrds the light…

 

[daniel_mourra]

Whats on the side of the closed duncan, is something maybe stinging it?

Absolutley nothing at all just swim area. Closest coral or rock is about is about 8 inches away.

 

[daniel_mourra]

How often do you do water change? And how much water do you change?

I change 20 gals (12%) every 7-9 days

 

[daniel_mourra]

I really need help… salinity has been very stabel jow fro about 2-3 weeks… vut the duncan is still closing… and apareently the “closed side” is exapnding…. This is so weird! Could it be some kind of bug or pest eating it? If extion spreading? Should i dip it in something? I just have SEACHEM DIP (iodine) and Coral Rx but it is expired…. Please see updated picture.

 

[jd22]

What fish do you have? Might be a nipper