Monte Carlo Patches W/ Leaves Turning Translucent And Melting Towards The Substrate

Dave Dela Cruz

New Member
Sep 23, 2020
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Sydney, Australia
Heya all, long time forum lurker here. Most of the things that I've done in my tank have come from information that I've learned here. I thought I'll jump in and join the community finally and engage :). Would really appreciate the help. Also please let me know if this is not the right place to post this.

I have this 9-month-old 55g and have recently gone down the co2 inject route (currently at ~2.5bps). I'm also dosing Seachem Potassium, Iron, Flourish and Excel following the seachem dosing guide.
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Noticed 2 days ago, that I have this patch of Monte Carlo turning translucent from the top new growth and appears to be punching a hole down towards the substrate. Today, I noticed a new patch of this come up just a couple of centimetres close to the original patch. It is worrying that it's happening at such a fast rate.

Is this some sort of disease or deficiency? I have runners growing on the edges and it looks healthy to me apart from this.
IMG_9212.jpg