Thanks for sharing first at all ;-)Here is the link to my ATI lab results from March 8th. This was about the time the growth stalled on my frag. also had a couple random frags STN from the base up, which is still happening once in a while. I know the nitrates and phosphates are a problem, so I have removed filter socks and increased feeding since then. See any other issues with trace elements?
//lab.atiaquaristik.com/share/0321283b7ffe11858817
That way it's awesome to look quickly at the ATI report.
By the way , in my 300DD build thread I have a post about my opinions on TN issues.
As you said already Nutrients are ........ not there ;-)
This will had been caused some issues for sure and contributed likely indirect to TN issues just simply because the immune system of the coral gets down after a longer starving period. So you got that right.
Don't hesitate to dose Potassium or Sodium Nitrates. See if you can feed much more ooooorrrrrrrr just simply reduce whatever you do to get nutrients down.
All right, so the Nutrients aside, and we won't be able to fully isolate your issues to a few things I noticed on elements. However there are some points, most are not too bad!
ALK too high for an ULNS system, causing tip burn and tissue burn. Better is below and up to 8 as a rule of thumb.
CA a bit high but acceptable.
Bromine and Barium not super low, however both I would raise to the recommended ATI levels at least. I do see that tanks that have low Bromine and low Barium levels tend to have TN issues. Just an observation, no proof!!! I do not have clarity what the lower limits are, but you will see likley better encrusting and a stronger resistance against coraline growth and Cyano if you raise them.
Fluorid. Ouch! Absolutely not acceptable. You will have so much better reproduction of tissue hence better (new Chromoproteins) fluorescence!!!
Here my recommendation, lift daily 0.1mg/L with an Element of your choice up to 1.3, if you want to be crazy go up to 1.5. Don't exceed that limit for now. The max is 2mg/L , above it will irreversibly kill coral tissue! So careful with the bottle on top of the tank.
However this Element is the most influencing trace (it's a Halogen) when it comes to color and growth ;-)
How fast it will deplete I will find out soon since I wait for my next tests to come back.
Some traces are in elevated shape so you seem to dose something to get them above NSW levels.
But all good, nothing concerning high.
Iodine is there, thats good. you may want to get something more. But overdosing Iodine is so easy, so careful. You can leave as is, but slightly higher will increase some purple and blue colors and vibrance, if other elements are corrected of course.
Mo bit high, stop using Kent ;-)
I would dose as a personal recommendation Manganese and Zinc, for improved overall health, but not a must.
Make the best out of it ;-)
-Andre