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Able to do 2 25% changes in one day? Only way to get em down fast is doing big water changes. Theoretically if you change 1/2 your water you remove half the nitrates at the same time. I don't really know if changing 25% twice in one day would do the samething.
This is the first time I've run into nitrate problems. Over 3 years and 2 tanks. I believe the nitrate spike is from sand bed being disturbed.
I have good flow through the fuge between the overflow and maxijet 1200. The fuge itself is about 75% of a 55g tank, lit by 5000k led flood lamp. Chaeto used to be basketball size. Ever since I harvested it last it has just shrunk down to maybe size of tennis ball. It's still alive and healthy looking, not sure why it stopped growing.
Ats is up flow design lit with red leds. It does grow some algae just not very much.
I've dosed iron in the past but stopped. I have started dosing iron again when I noticed chaeto shrinking, maybe month now. I will pull gfo and see if that's the reason macro isn't growing.

I just ran into a similar issue in my tank. Chaeto started getting pale, no growth, and my nitrates were rising faster than normal. I had just recently started running GFO and carbon and my phosphates were zero. I turned off the reactor and after a couple of days my chaeto has greened up. From what I can tell the lack of phosphates was killing it and it stopped taking up nitrates as well. I guess I'll just run my reactor with GFO every now and then to keep the phosphates low but not zero.
Have to tested the change water before doing your water change? Only reason I ask is changing 20% should have lowered nitrates about 20%. You might be adding nitrates with your freashly mixed water.
Just a thought I would have expected it to have come down more than this.

