Well I checked my params... hadnt done that in a while and they are a little off which might explain random closings...
Nitrates @ .25ppm
Phos @ 5 ppm
KH @ 7
Cal @ 350
Sal @ 1.022
Temp 78-81
The cal is low do I need to add some but I guess my main concern is the second pic, it looks like it ate something that tried to escape from the inside out.
I agree the bug kinda looks a little like a shrimp but not anything like my cleaners babies I have running rampant in the tank. The only other shrimp in the tank is a lone Fire shrimp.
Those orange zoas in the pic have been in my tank for a month or so and done well until yesterday. None of my other zoas looked like the "Alien" reference, just randomly closing.
As for the second link....
1. You have a zoanthid eating worm.
2. Sundial snails. Nope
3. A fish that is nipping at them, there are several well documented cases of this. None in the tank
4. An invert doing the same. Ive been watching.. I havent seen any
5. Unstable or fluctuating parameters. Maybe
6. Large Emerald Crabs or a Sally Lightfoot. Both can and will
consume, kill and cause polyp retraction. On rack, no crabs can reach
7. Sea Spiders. nope
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. nope
9. Nudibranchs didnt see any
10. Stray Voltage. dont thin so
11. Excessively high Iodine which would prove fatal. nope
12. Light shock nope
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. Nope
14. Other stinging corals. Nope
15. Chemical warfare. ??
16. Overpowering current. nope
17. Excessive collection of sediment. See post 1, 6 and 7 in the link below.
http://www.michiganreefers.com/forum...ighlight=Mucho nope
18. Nuisance algae around the polyps which will irritate them and prevent them from expanding. nope
19. Temperamental, yes, they are, there may be nothing at all wrong, that simply don’t want to expand for that day.
20. Fungus Didnt see any
21. Bacterial infection. Didnt see anything
22. White lesions also referred to as Zoa Pox. nope
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. Maybe
24. Extreme hypo or hyper salinity nope
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.
