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Believe it or not, sometimes montis can be more sensitive than a lot of acros. When troubles brewing montis are sometimes the first to show signs of stress. By the sound of I would look into Alk or NO3 fluctuations. Are you running a fuge? If you are, your NO3 may be higher than your test kits suggest. It took my a long time to figure this out. Not saying this is your issue, but I would definitely look into those 2 things first.
I'll say a comment about nudis since I have first hand experience. They do not necessarily affect color until the infestation is really bad. I had a nice big red cap that was a beautiful red color. It was the first hit with nudis. It maintained the color the whole time, just the edges looked "eaten".
My bet is water chemistry and I'm sticking to it, LOL! GL!
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