View Full Version : My Zoas are dying/dsiappearing

Oliver Giesler
03/27/2017, 09:28 AM
My Zoa colony is slowly dying/disappearing,the polips turn grey and then are no more with in 24 hours any ideas any one I am desperate

03/27/2017, 10:22 AM
Start with letting us know what your water parameter are.. lighting etc

03/27/2017, 10:23 AM

03/27/2017, 11:37 AM
This link might help.


Oliver Giesler
03/27/2017, 11:39 AM
Tank size 50 g 8x39w mix of ATI and Red sea Light bulbs.
Temp 25/26c
Salinity 1.025
No3 btw 5-10 ppm
Po4 <.25
Ca 450
Mg 1200
Alk 9
My Maxima clams are growing and nothing else is dying.

Oliver Giesler
03/27/2017, 11:40 AM
Fis one blue devil a fire goby a Fridman and two Black and white Damsels

03/29/2017, 04:15 PM
Just want to share my disappearing Zoa saga. I have a large rock in the mid area of my 29 gal JBJ Intermediate LED tank and it measures about 13" across. Six months ago the whole rock was covered in Zoas. My set up has a hermit crab, a 6 yr old Clown, a Yellow Damsel and 2 types of Star Polyps. A few months ago I noticed my Zoas were disappearing. They would first close and then becoming covered in a brownish/green coating but sometimes they would just disappear overnight. Before long I was down to only two small areas (each roughly 2"x6"). Nothing new had been added to the tank over 3 years and I was sure I had not made any changes, but after reading other posts about Zoas dying I realized I had made a few changes that I'm afraid may have led to the death of my Zoas.
I had changed the brand of Salt I used.....went from Kent to Topfin.....and also added a packet of Chemi-Pure Elite in addition to Purigen to the overflow.
(For 4 years I had used only poly filter and some Purigen in the overflow.....and every now and then I'd add a mix of GFO & charcoal.)
The other change that occurred in the tank was the number of Pods multiplied to what appeared to be the hundreds. At night the Zoas would close and Pods would be covering every square inch of the tank.

Whether the Pods were eating the Zoas or just irritating the heck out of them, I don't know, but I switched back to Kent Salt, removed the Chemi-Pure and now have only the Poly and Purigen in the overflow. I still alternate Purigen with the GFO/charcoal mix.
Also, a small Six Line Wrass and a Cleaner Shrimp were added to the tank in order to get the Pods under control. Within days the Zoas stopped dying and a week later I saw new ones growing. Needless to say it's now difficult to find a Pod swimming around, but my Zoas look great!

I think the Pods were the main problem but it also possible the Chemi-Pure and the Purigen were just overkill for my small tank. Also, I'll never change from the Kent Salt again.....forgot how much I like it!

04/01/2017, 04:12 PM
Do you regularly change water? I have had issues with receeding Z&P if I do not - I think that they use up all of the trace elements and start to suffer until I replace them with a water change.

04/02/2017, 01:38 PM
Where are you placing them in the tank? And...how are you acclimating?