Whole tank RTN

[Rchamp03]

I’m on my fourth tank and thought I had acros figured out. Then came RTN across the whole tank. No additions, changes in parameters, temp, lighting. Pretty sad.
The last to go was this Bali Slimer. Pulled it last night then this morning it has these strange clear globs on it. Any clue what these are?

 

[Flippers4pups]

Sorry this happened to you!

The globs are either it's defense mechanism, they "slime" when stressed or bacteria from the dieing tissue.

Can you give us some back ground on your tank and it's water parameters?

Do you dip your corals before placing in your system?

Any sudden changes lately?

 

[Rchamp03]

The only change in the last three months was adding UV about 2 weeks ago.
I’ve been listening to Ryan at BRS talk about the benefits and jumped in. Running low flow to manage ick.
My thought is that maybe the UV changed the bacterial balance and the corals (stressed from moving to the new tank in January) couldn’t defend themselves. It took out acros, stylish, montis, cyphastrea. So not likely a pest.

 

[Flippers4pups]

Highly unlikely the UV caused this.

 

[saltyhog]

How often do you check your parameters? How stable have alkalinity, calcium and nutrients been over the last say 6 weeks?

Usually whole sale RTN has a discernible cause but sometimes there just doesn't seem to be a logical explanation for "why".

 

[Neoalchemist]

Uv would'nt cause this unless the uv unit was deffective. The problem solvers on here really need to know water parameter specifics and some detailed tank history like like equipment, age of tank and problems and the steps taken to correct them.
Welcome, you are in the right place.

 

[drawman]

Agree with all the rest. Some history on the tank and parameters can help to determine potential causes.

 

[Uncle99]

There was a change to do what’s in the pic, tank wide.
Can you post
-age of tank
-parameters
-length of time parameter stable.

 

[Flippers4pups]

RTN/STN is almost always caused by a stress event. Environmental- water parameter sudden shift, light intensity/spectrum sudden change, contamination from a outside source....etc or a parasite or pathogen damage.

Typically starts out in stressed/weakened tissue, bad bacteria or pathogen/parasite attack the tissue, tissue dies and Ciliates eat the dead tissue. What's left is white carbonate skeleton.

 

[Rchamp03]

There was a change to do what’s in the pic, tank wide.
Can you post
-age of tank
-parameters
-length of time parameter stable.

100 gallon tank up since January. 20 gallon sump. Dual returns. M40 and two Maxspects for flow.

Moved rock, water and corals from 40 gallon tank that was thriving.

Running dKH at 8.0 checked daily with Hannah. Ca is 430, NO3 is 5 (Red Sea) PO4 is .07 (Hannah). Salinity is 35. Temp is 77-78 with Apex and chiller. pH is 7.9-8.3. No known parameter swings. Dosing 2 part via Apex DOS.

No new corals added since move. Did add four new fish.

Everything was settling in and starting to grow, then everything dies over the course of 3 days

Only change was adding the UV.

Tried fragging to save with no luck.

At this point my plan is to let the tank continue to cycle for a couple of months hoping that if it was bacteria if will die out with nothing to feed on.

Here’s the tank before the move

 

[bobssecrtsn]

You should try a triton icp rest. Have you cleaned your pumps lately ?

 

[piranhaman00]

Although the UV wouldnt be a direct cause to the RTN, what if the UV substantially cleared the water, leading to a rapid increase in PAR reaching the corals? An indirect cause so to speak. Just a thought I had, sorry to hear about this.