Zoa help

[reefwars]

Originally Posted by FitoPharmer

I picked up a mixed zoa colony when I was down at the coast a few weeks ago. I started to notice a few days ago the polyps are not expanding as much as they were when I bought them, and they seems to be somewhat dulling. I expected the dulling because the light setup they were under previously would stimulate zooxanthellea far more then my old 150W. But the polyps seem to be shrinking or shriveling somewhat which is worrying me. I checked out my water yesterday and today to see if it was cycling or anything and it seemed fine:

Ammonia: 0
NO3: 0
SG: 1.026
Temp: 26
Dkh: 7.3
Calcium: 390-400
Mg: 1350-1400

+10% water changes weekly

Right now I have only a few other corals in the tank but they seem happy, a small mushroom and 2 ricordia yuma. Before I had a acro, pavona, hydnophora, and pagoda coral that did well.

Off the top of my head the possible causes could be:
1. No fish or food is in the tank. The tank was in a fallow period and I have not yet added back any fish. There is very little food going into the system right now. A pinch or 2 twice a week.
2. Pod city. I have read they can be harassed by pods, and my tank is packed full, again due to the fallow period.
3. Cyanobacteria. I was not changing my filter socks enough, now that I have switched to changing ever 2-3 days the front glass is going back to green algae from red.
4. Foam background/spray paint. Could possibly be leaching into the water.
5. Sickness of some kind?

Any suggestion would be awesome. I am really worried tho Zoas and I have never done well historically. In my last setup they always seemed to dwindle away.

if you bought the frag from a fresh shipment on a piece of rock then possible predators like nudibranch.

could be pods but where my fragtank has no fish they are in there by the hundreds...large ones too and ive been watching them they seem to do no harm.its also amphipods that are the ones being watched for eating zoas...same with the asterina stars im watching mine like a hawk as they are huge i have one we found the size of a quarter:P


i would try moving the zoa frag around, if its a deepwater species they are know to melt away faster and for who knows what reasons.

[FitoPharmer]

Could it be a low flow or to much light? The turnover in the tank is 25x plus but its not in the higher flow area, but the polyps are moving back and forth a bit.

[reefwars]

Originally Posted by FitoPharmer

Could it be a low flow or to much light? The turnover in the tank is 25x plus but its not in the higher flow area, but the polyps are moving back and forth a bit.

that would be fine in fact they can handle much more my tank is running over 50x and my zoos grow nuts even the slow growers.

phosphates is a concern,as can be too much light....generally start all zoas down low on sand move them once all polys stay open all the time.

also zoas and palys are a vast speces so if this coral doesnt make it another may flourish....zoas can lose their frill and come back and can stay closed for many weeks.....when it dies the polyps will melt fast good luck