Help me for Acropora.
- Thread starter Shahin bahrami
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MoshJosh
2500 Club Member
Could be be RTN (rapid tissue necrosis) brought on by sudden changes or unfavorable water quality.
What are your parameters, how long have you had this coral, and recent changes or tank additions?
What are your parameters, how long have you had this coral, and recent changes or tank additions?
Last edited:
Shahin bahrami
Community Member
It has been in the tank for one month and eleven days. All parameters are in range except potassium. Potassium is 360. Nothing new has been added. I siphoned 10% every ten days.
Shahin bahrami
Community Member
Your answer is very valuable to me. I will take measures to improve the water quality.
BristleWormHater
Valuable Member
Any changes to lighting?
Shahin bahrami
Community Member
yes. Reduce power from 50 to 45%.
BristleWormHater
Valuable Member
Then I would suspect rns like @MoshJosh said.
BristleWormHater
Valuable Member
Try to get white light pictures those help a lot
What are water parameters? Any big recent changes?
Shahin bahrami
Community Member
Shahin bahrami
Community Member
PM Corals
Community Member
I think it would help you to list your numbers. Saying everything is good expect x seems unrealistic. That acro doesn’t seem to be thriving, so it likely wasn’t a recent change, but poor water quality followed by something.
BristleWormHater
Valuable Member
Sorry I meant set the lights to all white so we can see the coral clearly.
Shahin bahrami
Community Member
oh ok. i will do it
Shahin bahrami
Community Member
how old is setup? First acro? Looks relatively new and what are water parameters 
Dburr1014
10K Club member
Not good.
So we've had a couple people all for parameters and all you've said is "all good, potassium is low".
What is all good to you?
Need to know what you tested and what test kits and what your numbers actually are.
That coral is dying.
Tank looks like it's in an ugly phase which suggests it's a new setup. BTW, new setups are typically not good for SPS unless you are a seasoned reefer.
I'm just mentioning this because I've had it happen in every tank I've had sps in. Sometimes a piece will RTN or STN with no explanation that I can find. If this is your first acro then by all means try to figure it out and list your parameters as folks have requested.
I've woke up in the morning to a white stick from RTN on a coral that looked good the night before. Every other coral in the tank is fine. This has probably been the most frustrating part of keeping acros for me. I'm a newb with only 18 months experience tho.
EDIT : the rock looks like this may be a younger tank? I definatly had more losses the first year. The older my tanks become the easier it gets to keep things alive that I couldn't keep early on. I attribute it to the tank maturity thing many new reefers don't like to hear.
I've woke up in the morning to a white stick from RTN on a coral that looked good the night before. Every other coral in the tank is fine. This has probably been the most frustrating part of keeping acros for me. I'm a newb with only 18 months experience tho.
EDIT : the rock looks like this may be a younger tank? I definatly had more losses the first year. The older my tanks become the easier it gets to keep things alive that I couldn't keep early on. I attribute it to the tank maturity thing many new reefers don't like to hear.
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Shahin bahrami
Community Member
Setting up aquarium: 7m 26d
this Acro: 1m 12d
Test Kits: Salifert
Light: XR30 G6 Pro
Skimer: Regal 150S
Wave: MLW30 2#
Pump: MDP10000
Balling method
Volume: 425 L
Today Test:
SG:1.025
T: 25.9°C
pH: 8.25
KH: 9
No3: 5
Po4: 0.03
Ca: 440
Mg: 1400
I2: 0.02
K: 390
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