+1:lol:

1. Clean your probe
2. Any higher than 400 is too much...esp if you are dosing with ozone
3. I have a lot of sps growing in the 320 - 350 range

So if you do have readings higher then 400 and not dosing ozone how do you bring the level down? Water changes? What is the cause of the level going higher then 400?

Keith

You can't bring them down safely. Your tank will decide where it wants to sit. It takes time. Redox levels don't swing that much from 250 - 400. Mine swings 40 points. In fact a 10% water change does not affect the ORP that quick. Water changes are good if you don't run ozone. Fauna Marin asked me to do 10% changes a week...at first I was reluctant...but the benefits from it are showing. Your water should be RO/DI not the bottled stuff....Do your readings fluctuate over a 24 hr period? When you clean your probe the reading should be low but they eventually rise? Does your redox reading change if you go from high flow too a low flow area(sump)? If no to those questions then your probe is screwed. I would take your probe and plug it in into another tank to see if it make a difference. Find a tank with good SPS growth.

My tank has tons of sps in it. I do believe my probe is working correctly i am trying to understand the readings and what they mean is all. My DT is 240 gallons and my sump is another 200 when i do a water change i change 60 gallons. I will try cleaning the probe really good and wait a couple of weeks and see what i get for readings. They say to recalibrate the probe once a month but that it take two weeks to get a actual reading so the probe is only giving you a good reading for two weeks. I just want to understand it all.

Keith

Geez I wish I had my Profilux now, it will be 8 weeks before I get the new parts for it. I had it working for five days and after correct calibration it was reading 207 for redox. This was after a water change, prior to the water change it was about 268. I was testing my water params and they were zero for nitrate, nitrite and ammonia. When I first calibrated it, it showed 85 and then slowly went up to 207 then to 224. The I had a flood and my Profilux was toast.:neutral:

The fellow I bought it from said the redox meant how much oxygen was in the water... I didn't know what he meant. I thought I would set up and ask questions about it later...

I did not know if the numbers should be lower or higher but the cleaner my water was, the lower the readings.