Zoanthid

[scubafan]

Hi, a few days ago I bought a green Zoanthid frag. So far
it hasn't opened very often and it has only opened up all the
way once. I all ready tested the water and its fine, and today
I bought a brown Zoa and put it near my green one and its all
ready opened up.

[locod]

i had some that i got, it took them about a 1 1/2 weeks before they opened, now there some of the fastest growing in my nano. i wouldnt worry just yet, think it just takes some longer to acclimate.

[feixjai]

How long has your tank been established and what kind of lighting do you have? Corals need to light acclimate and acclimate to the tank. Just give it sometime since they are still fairly new to the tank. Or you can place them on the sandbed and slowly bring them up to the spot that you would like them to be placed on.

Zoas are great,colorful, and hardy corals. They shouldnt die off easily unless they are diseased or infected.

[njdevilsfan]

it could be a million things
did you dip em before putting them in the tank

[Iraf]

worst case move them to a different spot in the tank, sometimes different zoa's like different lighting or water movement as opposed to some of their kin in the same tank

[omard]

Originally Posted by njdevilsfan

it could be a million things
did you dip em before putting them in the tank

Here is a few of those "million of things"


(3Reef Thread: Help With Polyps)


25 Reasons why your polyps won't expand.

1. You have a zoanthid eating worm.

2. Sundial snails. ( I've experienced this ) Zoo eating snails.

3. A fish that is nipping at them, there are several well documented cases of this. ( I've experienced this )

4. An invert doing the same. ( I've experienced this )

5. Unstable or fluctuating parameters.

6. Large Emerald Crabs or a Sally Lightfoot. Both can and will
consume, kill and cause polyp retraction. ( I've experienced this )

7. Sea Spiders. ( I've experienced this )

8. If shipped, the water was much too cold and you placed it directly into your tank without slowly drip acclimating them. Or, the inverse, the water was too warm.

9. Nudibranchs ( I've experienced this )

10. Stray Voltage. ( I've experienced this )

11. Excessively high Iodine which would prove fatal.

12. Light shock

13. Polyps that were kept in PC or VHOs and then placed mid to high level under MH's without light acclimating them. Possible burning could also occur.
or
Polyps that were in maybe dual 175 SE Mh and then placed mid to high under 400 watt DE MH, will cause possible burning or a delayed expansion.

14. Other stinging corals.

15. Chemical warfare.

16. Overpowering current. ( I've experienced this )

17. Excessive collection of sediment. See post 1, 6 and 7 in the link below.

18. Nuisance algae around the polyps which will irritate them and prevent them from expanding. ( I've experienced this )

19. Temperamental, yes, they are, there may be nothing at all wrong, that simply don’t want to expand for that day.

20. Fungus

21. Bacterial infection. ( I've experienced this )

22. White lesions also referred to as Zoa Pox. ( I've experienced this )

23. Amphipods, which I have only witnessed eating sick, dead, dying, decaying polyps. Doesn’t mean they won’t eat perfectly healthy ones, I just haven’t witnessed it, some have.

24. Extreme hypo or hyper salinity

25. And the final reason may not be any of the reasons above. Why? Periodically, polyps will retract from days to 10 to 14 days, during which they will clean themselves externally. Then without any advanced notice, they will unfold like a flower or a summer’s morning.


Hope something above might look familiar.

Good Luck!

[baugherb]

Some just take a while to acclimate.... Give them some more time....

[rmelvin23]

The 25 list is very informative. I did not know that they did the deep cleaning mentioned in number 25. All good things to know.