Will high orp levels cause rtn? I have been dealing with issues with getting acros to grow. Everything is spot on. Ph-8.0-8.2, calc-400-430, alk-8.2-8.5, phos .01, zero for ammonia,nitrite and nitrate. The only thing I am thinking could cause an issue is either my lights. Which are two ap700s that are 16" above the water on my 180. Peak % is 27. Another possibility is my orp is 400-450. I do not run a ozone generator so I don't know how I could reduce it.
High orp and rtn
- Thread starter DrewZ
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Continued low flow will kill an acro too. PH swings IME as well.
hmmm. Do you have a par or lux meter? It doesn't sound like much light.
also look at the coral and try to use an Inch per second measurement. depending on where a coral is in the tank counts too.
Macdaddynick1
Valuable Member
low nitrates is what's likely the cause of your issues
greg 45
Active Member
I would not trust hobby grade orp probes. Also when was the last time it was calibrated . They aren't very accurate.
You seem to have a low post count not that this is bad / is this a new tank . I run ozone and it's a struggle to get high orp.
Do you have a par meter 27 % seems like a low percentage .
You seem to have a low post count not that this is bad / is this a new tank . I run ozone and it's a struggle to get high orp.
Do you have a par meter 27 % seems like a low percentage .
happyhourhero
Burner of the Tips
Can you elaborate on this?
A scientific method of measuring flow is how much is going past an object. the distance from point A to point B. My finger is about four inches. So I send some dust with a turkey baster or food in the water, and say one one thousand.
It does get trickier in a really turbulent flow as opposed to a Laminar flow.
http://www.advancedaquarist.com/2003/4/beginner
And The only link Mr Riddles article I could find. http://www.oyster-restoration.org/wp-content/uploads/2012/09/Riddle-2011-flow-aquaria.pdf
happyhourhero
Burner of the Tips
Thank you! my tank would be blur = blur.
Dana would be proud!
For the OP, check those links out. The first talks a lot about flow and coral metabolism.
nervousmonkey
LPS Lover, SPS Enabler
Try to clean your ORP probe, they get fouled and will read high. If you clean it well I bet your ORP will come down. That ORP is almost impossible in a tank without ozone
Tanks roughly 8 months old. Reason for being so low is I had it around 40% and polyps weren't really extending on anything. Acans were receding etc. I have a 30 gallon tank on the same system and a kessil 160 and everything thrives in it. So I kept thinking it had to be my lights.
nervousmonkey
LPS Lover, SPS Enabler
I don't know. I run ozone as well and I don't think I could get ORP that high at max setting for a week. Well, maybe but everything would be dead.
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My ORP went high, same range as your ORP, when my salinity dropped because I didn't calibrate my tester. Once I raised salinity back up, my ORB was in the 275-325 range. And yes, I was having RTN issues when my salinity was low.
Calibrate your refractor, test your salinity as one other possibility for your issue.
Calibrate your refractor, test your salinity as one other possibility for your issue.
