It was toast.

It just continued to deteriorate and became a pile of goo so I removed it.

The Aussie is doing great and I have continued to work on the turf algae issues which has helped the Aussie a lot. It's opened up quite a bit and I have been target feeding it more frequently as well.
Thanks again for everyone's help. I am still not sure what the issue ended up being.
One thing I will note is I ended up picking up a Hanna Alk Checker. Compared to my Red Sea test kit, it read much lower than what I thought it was. Red Sea was reading around 9-10 dkh but Hanna was coming up at like 7-.7.5. I have slowly increased it up to 9 over the course of the past few weeks. Not sure that would have been the root cause but I did read that Turf Alage can show up in lower alk systems.
Any ways thanks again and better luck next time if there is one.