STN due to low PH?

[StarF]

Hi

Ive had some truble with my corals, some of them are slowly getting STN, and after a while i see that my ph is realy low, like 7.6 - 7.5. Is this due to the low ph?

i cant figure out what else is wrong, and why i keep having isues with my corals. i have boosted my ph to around 7.9 - 8.0 and continue to do so, and some of the corals looks happier now, more PE. But the ones that were slowly dying are still slowly dying, can this be because it was just to late for them?

any idea on why my PH keeps dropping? my redox is around 250, but i run 500mg ozon 24/7 just to keep it at this level, if i remove it, it will drop to around 100. I have tryed to change water, dosent help?

i am thinking mabye someting organic is going on? i realy need some advice, as i am slowly lossing my interest in this hobby, after around ½ years of truble..

po4 is around 0.
no2 is 0
no3 is around 10.. slowly dropping, as i just moved my aquarium
i usaly run VSV but i stopped doing so, until i figured out my problem.

ca around 420
kh around 10
mg around 1400

 

[nvijtiuk]

You should increase oxigen level, since alkalinity is relatively high. Check the room ventilation, skimmer...
Corals affected by STN should be fragged immediately in order to save as many as you can.

 

[StarF]

the windows are always opened. i tryed fragging but dosent always help.

but could ph be my reason corals are slowly dying? is 7.6 - 7.5 harmfull in that way ? (hoping i finaly have found my main source of problems here)

 

[PRDubois]

What Salt mix do you use?
When I used IO I had low PH.
Changed to RC and all is good

 

[StarF]

Direct Ocean, and i use IO water..

curently just raising my ph everyday with kalk wasser.

 

[StarF]

no one got any input on this?

at what level will low ph damage corals?
7.8 ?

 

[mushroom head]

Nothing wrong with a ph of 7.8 mine drop to 7.7 at nite.And as you can see, they look like crap.....

 

[volcom69]

I wouldnt worry to much about the ph but worry more about keeping the alk steady. The ph wont harm your corals unless its super low, i have already droped down to 7.5-7.6 at night before i started to use kalk and had no problems because i was keeping the alk higher. I would look other reasons why instead of the ph.

 

[StarF]

so what other reasons could there be? i cant find any,

my alk is stable, as i use a calcium reactor.

the only thing off in my aquarium is the ph...

 

[StarF]

a ph of 7,5-7,6 will damage corals ?

 

[kaserpick]

Even though you're not sure if it's damaging them, it still wouldn't hurt to bring it up. If you can consistently drip Kalkwasser, then you should be able to raise it slowly. Just a thought.

 

[StarF]

well the main isue is, i am getting tired of this problem, ben having it for a while now, and i am slowly lossing my corals. its the only thing i can find that could be wrong. so i have given it 14 days to stop, or else everything will go on sale.

just found another coral today, that looked fine yesterday, but today its dead in the bottom.

 

[Znut Reefer]

Do you have good water movement? That would also cause your sps to have stn problems if not.

 

[StarF]

yes the pumps are 4x 6100 Tunze.. to around 1200L water, along with a wavebox..

 

[StarF]

I have noticed that some of my corals have a green tan to them. My red milipora, have gren skin somewhere, my yellow montipora digi, have becom green, and my yellow acropora the same.

i know this can be cause of iron, how ever i dont add anything to my watter atm, and i dont have any metal parts in my water.

I have tryed to change 500 liters of water, this havent changed anything yet, i am getting close to just give up on corals and sps for now, so any tips or ideas are greathly appriciated.

 

[CleveYank]

Is the ozone that is being dosed being filtered back out of the water stream before it gets into the rest of the system? Ozone is a stong oxidizer and if you do not off gas it through a protien skimmer and or filter it with carbon you can burn the tissue right off of your corals. Your posted redox numbers would indicate that ozone poisoning would not be an issue. But you never know and a residual ozone test kit might be a good idea.

 

[StarF]

iam running a skimmer..
i am running active carbon.

if i turn off my ozone my redox starts dropping belov the 200 numbers... so i dont dare doing that..

i am starting to think something is being decomposed in the tank, althought nh4 and no2 is undetectable, and no3 is around 10..

what is worring me the most is corals seems to get a green tan to them.

 

[CleveYank]

So you are purifying ALL of the ozone enriched output through carbon?

 

[StarF]

ozon is going into skimmer..

and i am running a filterbag and a deltec filter with carbon.

 

[CleveYank]

Do you have a pump or heater (any electrical device really) connected to the system that may be leaking out excessive voltage into the system?

You've inspected heavily and dipped and double checked for parasites? I had AEFW and only found them by accident and had to adopt an arbitrary inspection until I got rid of them.

There's no heavy metals getting into the system from a saltcreep point with wiring or hinges or something metallic fallen into the system somewhere?

Unless you light, alk or pH spiked the system those would be the other suspects I'd think based upon what you have posted.