Help Please: Still Slowing STNing or Fast RTN

[Psionicdragon]

Hello everyone.

I would like to ask for your assistance as I am stumped.

I recently had an alk spike from 10-13 a week or two ago and it has slowly dropped back down to its normal 10 range.

My alk drops 1 dkh per day and I dose to bring it back up on a daily basis. I recently set up a doser to break it up into 4 equal parts of dosing to maintain a more steady Alk parameter.

The issue I am having is that a lot of my corals went RTN after the spike and some colonies started to STN from the base up. PE has been really bad and I am assuming thats because of the nutrients.

The parameters have been pretty stable lately, but things that have STN are still continuing to STN and some are RTNing. Things that had STN but stopped in the past has not regrown over the STN part.

So I am not sure why things are still STNing and RTNing...any help and input would be great.

Heres my parameter:

Alk 10 DKH
Cal 430
Phosphate .05
Nitrate 5ppm (API)
Salinity 1.026
Temp: 78

 

[danil]

I would frag all STN corals inch from effected area. The thing is once it's started it won't stop. Only most resilient spices can survive (like some birdsnests, montis). I've seen some survival colonies but it's more like exception from the rule . Frags can survive though.
Also I would lower Alk further. 10dkH is still high for me I've found that system is more stable with Alk in 8-8.5dkH range. With high numbers we push them too much demanding faster growth so higher chance for STN if it ticks up.

 

[Reefnub]

Something similar happened to me. I think it was phosphate and alk spike, I added a lot of new dry live rock. Before that my ato kept adding kalk and then some of my corals started rtning. They stopped after 3 days, I would frag the part that isnt rtning f I were you. I lost a red dragon coloy and a ora indigo purple stag to rtn, the frags are stning. I'm hoping it stops.

Other than that my corals are doing ok, I see everything stabilizing.

 

[wonderz]

Just keep everything stable and it will regrow over the white skeleton. Although it will usually takes months for it to get back to its former self depend on the percentage of lost tissue compare to the whole colony. The ones that you are seeing still STN/RTN are probably shedding the remaining dead tissues assuming you got the parameters back on track.

 

[toothman]

nsw is about 7, 10 will stress corals in my tank.

 

[tripdad]

What are you dozing with? It sounds like 2 part, which brand?