Iodine addition in zoa tanks? Coincidence?

[kpk]

Ok so Over the past month or so all my zoa frags have slowly closed a couple polyps. All others have looked ok, but a few polyps on all frags have closed except for my fruit loop frag.

Anyways I have a low nutrient barebottom tank, filter socks on the overflow, skimmer rate for 2.5x my total volume, etc. Yesterday I tested and nitrate 0, phos .05, kh 7.7, ca 330. I then changed a little water. The polyps just acted the same throughout the day. This morning I went ahead and put a couple capfuls of kent tech-I in the tank. When I got home from church about 1 hour ago the lights are on and pretty much every polyp is open!

Can iodine do this?

All sps, lps, etc look fine. I change 10g per week with reef crystals, run carbon, and a little gfo. Total water volume about 105g.

 

[Fishypapa]

Not sure but I've read and drop some iodine in periodically. Supposedly it's good for them but too much will crash your tank.

 

[Racinrevo0818]

I would get your calcium up to at least 380

 

[A. Grandis]

Ok so Over the past month or so all my zoa frags have slowly closed a couple polyps. All others have looked ok, but a few polyps on all frags have closed except for my fruit loop frag.

Anyways I have a low nutrient barebottom tank, filter socks on the overflow, skimmer rate for 2.5x my total volume, etc. Yesterday I tested and nitrate 0, phos .05, kh 7.7, ca 330. I then changed a little water. The polyps just acted the same throughout the day. This morning I went ahead and put a couple capfuls of kent tech-I in the tank. When I got home from church about 1 hour ago the lights are on and pretty much every polyp is open!

Can iodine do this?

All sps, lps, etc look fine. I change 10g per week with reef crystals, run carbon, and a little gfo. Total water volume about 105g.

Yes, it can. It did for you, right?
I would suggest to remove the gfo. You probably don't need that anyway.
Carbon is good, in small quantities, as needed.
Keep nutrients low and a consistent/stable maintenance schedule/parameters.
Make sure your lights are good for the long term.
Remove detritus when doing water changes.
You can bring your Ca a little higher, like 380/420, but make sure alk is kept at about 7 or 8 min.
Keep dosing small quantities of the Kent Tech-I daily.
That's better than twice or 3 times a week.
Good luck!

Grandis.