che potrebbero rompere le palle ai coralli più di quanto facciano gli anfipodi :-D
cmq io uno ce lo proverei a mettere :-)

Io ho una colonia da mesi che anche al contatto non si chiude, neanche di notte e neanche l altro giorno che li ho staccati dalla basetta fuori dall acqua.
Vi é mai capitato ?
Sono vivi eh e
:-)


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si certo, se trovano nutrimento in sospensione e disciolto, molte colonie di zoanthus restano aperte anche la notte
mentre i palythoa, essendo predatori attivi, la notte estroflettono i tentacoli anche più che di giorno

Ma neanche al contatto con il mio dito si chiudono , le avevo tirate fuori per staccare la basetta bianca .


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strano allora :-))

Sicuro che non te li hanno venduti di plastica?????? ah ah ah

Penso di no visto che si riproducono ;-) e sono di una colorazione spettacolare


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..di sicuro non hanno questi problemi:


25 reason why your polyps won't expand

1. You have a zoanthid eating worm.

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

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.

http://www.michiganreefers.com/forum...ighlight=Mucho

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.


I'm sure there are many more. If you have witnessed anything that you know for sure is a contributor to this list, please add it. Hopefully this thread can become a springboard for some discussion on this topic.

Mucho Reef

PS. There are proactive measures that one can take to prevent or greatly reduce your chances of experiencing the above. Most notably...

1. Dipping
2. Close inspection
3. Quarantine your new purchases
4. Educating yourself on what to look for and recognize. I think a lack of knowledge is the one major contributors to most unfortunate experiences in reefing.

tutto il post qui
http://www.reefcentral.com/forums/sh...25+reasons+why

Grazie per il post iapo, davvero interessante!

Addirittura mai avrei pensato che rimanessero chiusi per pulizia eheh


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