Mcgyvr, I agree regarding the Algae problems, and I have been bringing that under control for some time. Most of what you see is gradually melting away. My initial issue was high Phosphates, which I have now reduced, originally using Phos-Correx. I have now moved to Red Sea NoPoX. Currently Phosphates are ~0.02 ppm and Nitrates are between 4-10 ppm. I am targeting Phosphates ~0.01 ppm and Nitrates ~1 ppm for the moment.
Here is an earlier photo of the leather. In this photo the base is quite healthy and white.
At this point I am going to remove the rear ‘arm’ as that is the most badly damaged. I will hold off on the remaining two for now and see how it goes, but may need to remove them also if the decay doesn’t stabilise.
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