STN (Slow Tissue Necrosis)

Man I just discovered my birdsnest and some other sps have STN I guess? They are slowly dying at the tips and or base! I am adding a additional koralia 4 to increase flow. I might not have had enough, I just moved from a 75g to a 90g and only had the return and a K4.
Does anyone have any concerns with STN or does it just go away with more flow and coral placement? Also should I take the colonies out and dip them as I would if they were new to my tank? Many have said I should just snip the dead pieces off and it should take care of the problem? What do you guys think?

 

STN starts at the tips and works its way down from there. Usually it is due to high alk or extremely low phosphates. Are you running gfo?

 

Yeah I have a BRS running with gfo & carbon. I check my params weekly but I will check again and post. Why is it only affecting certain frags?

 

Think STN is inherit to SPS, hence it will only affect them.

Why certain ones and not others is a million dollar question! I lost a nice ORA verde mini colony to STN and am still battling with it now on my Redplanet frag. Finding the exact cause for it in any particular system is difficult as there are many contributing factors- salinity swings,Alk swings, temp swings, too many nutrients,too little nutrients, abrupt changes in lighting etc. Almost anything that can stress a coral and weaken it.

I believe that for my own system it's nutrient deprivation through bio-pellet use. I've just recently began increasing feeding. And I'm working on getting some more variety that specifically cater to SPS.

Done a ton of reading lately through the simple input of Acropora STN in my google search engine .

Here's my RP,taken last week. It's only been in my system for a month. The pic below began occurring two weeks after I got it.



Not something I'm proud of.

You can glue the sections that are affected but I have no experience with this. I doubt flow is the sole cause for yours, but some extra can't hurt if you plan on having SPS thrive anyway. Don't recommend dipping at all as it will only stress the coral more. Unless you have reason to believe it may attributed to a parasite.

 

here are my params, I just added a Koralia evolution 1050gph tonight so I may see something different in the morning?

Phos 0
Nitrite 0
Ammonia 0
ph 8.14
copper 0
calcium 420
nitrate 0
magnesium 1300
strontium (unknown)
dkh 7
salinity 1.025
temp 77.9-80.5

 

How long did it take your phosphates to get down to zero? I just bought a gfo 1 week ago and havent seen any change.

 

I have had the same problem- cal/mag has always been the root problem. I have never figured out what is actualy perfect-rather, just what is generally prefered. I really wonder if this is a seasonale problem- more often then not, it seems to be.

 

here is the bible on water parameters.

Reef Aquarium Water Parameters by Randy Holmes-Farley - Reefkeeping.com

It didnt take much time at all for phosphate if you have good flow and do proper water changes. I change less volume per change but I do it every week.

 

I have had necrosis happen to one of my corals after a tank move, I save a good chunk of it by simple cutting off the healthy piece. The rest that had the dying part on it went completely days later.


Note: you need to cut past the healthy section. So no damaged piece is still on it.

 

I did just have a tank move less than 30 days ago went from a 75 to a 90. I cut the dead tip off but it came back the next day.