Have you run Phosguard or any chemical media that might contain aluminum ever? I ran Phosguard for a while until I learned that it contained aluminum and I saw a post that tested the affects of elevated aluminum on a toadstool. Mine was starting to behave the same way as the test subject. I removed the Phosguard, flushed out the rear chambers of my Biocube and did a big water change. Next day my toadstool looked great. I think I might simplify the chemical filtration to either carbon or Renew.
My toadstool loved to get blasted regularly by my Hydor Flo when I used it. My shrooms did not, so I removed it. Try moving it more into the flow if possible.
Try another dip. I've read that they can handle Lugols dips as long as 4 hours without any problems. But I'm not sure I'd recommend one that long.
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