Zoas getting dark and falling off

[avishek]

After keeping this zoas for two years duddenly my green zoas have started falling off rock. First they stop opening then they fall off. Some of them have showed brown discoloured centre before falling off. Some are opening but becoming loose and falling off. My water parameters are no2:0 no3:0 nh3:0 ca:420 mg:1300 sal:1.024. Tried doing iodine dips since last 3 weeks. No results. This whole thing is going on since last couple of months now. Can anyone help?


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[jesstabby]

I can't tell for sure from the pic, but are there asteria starfish in your tank and more importantly on your zoa? If so they may be the culprit.

 

[organism]

Could be zoa pox, have you checked for nudis? Tried any dips?

One thing I can tell you it isn't is asterina starfish, that's not the type of damage they cause imo and they'd be all over that piece.

 

[avishek]

Ya given furan 2 dips. Not seen any asteris stat yet.[emoji31]


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[650-IS350]

Looks like irritation to one of the factors of

pH
Alk
lighting

what are these parameters

 

[avishek]

Ph and alk are ok. For lighting i use sanrise led. Still couldn't make out the cause.


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[A. Grandis]

We need numbers for the alk and pH... OK not enough...
Mg, Ca too...
Need much more info and observations to try help. Filters, foods, other chemicals...
Try find predators at night... Fish could also be predators.. more info..

Look like your lights aren't helping them too. That's the only thing I could guess from the picture..
More info please..

Grandis.

 

[A. Grandis]

Ops sorry, Ca and Mg are fine...

If they were fine for so long and only now problems appeared... I wouldn't worry about predators in the system, unless you added something recently. I would think it's more a nutrient problem. The light isn't good enough (talking about quality, not intensity). Besides that, you aren't probably offering any dissolvent nutrients to the zoas.
Metal halides or T5s are the best!! Forget LEDs.

If you have a phosphate reactor please remove it from the system.

Grandis.