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I dont think thats discoloration, I think its the coralline above that's making it look darker my tank does the same.I’m not sure if this is discoloration or a problem. Really dark towards bottom of silicone.
If your really worried scrape the top half of the coralline and see if the darker part changes shape, I think your fine thoughcorraline is covering the silicone, it’s really stuck on there. Only time it’s been clean when I rip cleaned the tank and used a lot of peroxide.
You’re right, it was the coralline casting a shadow.I dont think thats discoloration, I think its the coralline above that's making it look darker my tank does the same.
Try scaping it off and see what it looks like
Edit: If you look at the picture its even the same shape as the coralline