After 2 weeks of adding KNO3, now adding 60mls/day, which equates to adding 2ppm per day of nitrate for my 73 gallon tank.

I am now at 1.5ppm NO3 and phosphorus is 0 using Hanna ULR meter. I was using about a half a cup of GFO. I have now turned off the GFO because I do not want my phosphorus at 0.

I was needing to run at least 3 cups of GFO to keep my phosphorus below .03ppm before I started adding KNO3. If I didn't my phosphorus would hit .3ppm very quickly.

My tank appears to be using close to 2ppm nitrates to maintain a nominal nitrate level in the tank. I like my current level of nitrates however it appears the higher I go the lower the phosphates get. I think this is going to be a bit of a balance game, lets see what happen now that I turned the GFO reactor off.

What I have noticed in my tank with the higher nitrates is better growth and color of the corals, not quite as good as I want but my coralline algae is growing like nuts, hence the larger draw of Calcium.

I caution anyone thinking that they can control their phosphates by adding nitrates. My situation was a particular situation where I have a low bio load, feed lightly, strong skimming and had absolutely no nitrates in the system.

"OUCH". Last weekend my power went out for 4 hours. When the power came back on I guess the ATI Hybrid went back to factory settings and looks like I fried some of the corals. I have never run the Led's higher than 80%. They were running at 100% all week and the colours in the corals have paled out since last weekend. I just figured it out today.

Other than that I am not running any GFO for several days and my phosphorus levels have not gotten about .003ppm or 1 on the Hanna ULR checker.

Hopefully the coral colour issue was the lights.

Sorry to hear. I can't believe that such a high end fixture doesn't have a failsafe for that.

Sorry to hear about your timer issue ...

Glad to hear you've been able to remove your GFO.
If you recall from our conversation, that was the main reason I suggested adding some form of NO3. It wasn't to color up your corals, but glad that's been a positive effect.

I'm still GFO free, and haven't needed to add any NO3 since my last report.
I'll be more than doubling my fish load in a couple weeks, so hopefully I'll get some PO4 back in my tank soon.
Still sitting @ zero for both NO3 and PO4, even with heavy overfeeding of my 4 fish.
I'd like to get my readings up a bit, but my corals appear to be perfectly happy for now in the zero range.

Looking forward to your reports now that you've removed your GFO.

From what I have read it will hold the settings for a short while. But when the power goes out for a long time everything is lost even the clock settings. AS nice a unit it is it is extremely difficult to program.

Yikes! Roasting corals sucks - it's a long road to recovery. :(

I just re-started NaNO3 dosing too, but I'm adding KH2PO4 as well since I have neither measurable in my tank. Makes sure you don't bottom out PO4. :)

I am hopeful the corals will be OK. The only one I may loose is a mystic sunset monti. Not the end of the world as I am battling the early stages of monti nudibranchs Likely stress of the water changes combined with stress from the lighting combined with the nudibranchs.

I am trying to get 2ppm NO3 and .03 ppm PO4. As of yesterday I was at .003 ppm Phosphate 1/10th of where I want to be.

MY tank is sucking up the phosphate and the NO3 right now.

Where do you get the Potassium phosphate? What rate are you dosing?

I got it from a friend, pretty sure he got it from "The Plant Guy". Google it, he's Canadian. Not allowed to post a link.

I'm adding 0.02 ppm per day right now to see what happens. So far only dosed twice.

Great let me know how it goes with the phosphate. I tested mine last night and I had .02ppm phosphate. I am happy with that for now.