The zoanthid problem... (Zoas not fully opening, only their mouth can be seen)

Katze

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Hello everyone !

I purchesed 3 zoa frags each from a different place, about 6 months ago.
During summer after changinge my light, adding a torch, having cyano, and temperature +26C for a week, then a month later none opened not one head ! Mind you that I had to decrease flow because of my torch.
I bought a 4th frag 1-2 months ago, which has 1 head with 2 smaller ones and that opens up very well.

Details:
Params 2 months ago:
NO3 100
PO4 0.00 (rarely) - 0.04
Mg 1350
Ca 460
Kh 8.6
Nowadays
NO3 <25
PO4 0.00 - 0.04
Mg 1350
Ca 460
Kh 8.6
Tank is 1.5 yrs old
Livestock: 5 fish not one coral muncher, no CUC.

Question is that what could cause them still being closed ?
 
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Katze

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what's par are the zoathids getting? you may have to move them closer to higher flow and lower PAR. area
Par is around 130-150 at max where they are at.
How's the mat of the zoas look? Solid or like pealing off? Got a picture?
They are solid but they shed like leathers would, atleast sometimes they do.
 
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