Your coralline most likely died because of a possible algaecide in the Vibrant - lights are a red herring here... look other places. Even at over 100%, there should be no death - we are talking about color and fine tuning at this point and you are a long way from there.
I would actively run some GAC, do a water change, throw the Vibrant away and make a vow to never use any "black box" or "miracle" product again. The stuff is bad news, IMO, as I stated early on.
Get 2 or 3 pincushion urchins for the algae - they will eat coralline too, so some people hate this, but my tanks grow coralline so fast that it does not matter. Anything that eats coralline is a friend of mine.
I would actively run some GAC, do a water change, throw the Vibrant away and make a vow to never use any "black box" or "miracle" product again. The stuff is bad news, IMO, as I stated early on.
Get 2 or 3 pincushion urchins for the algae - they will eat coralline too, so some people hate this, but my tanks grow coralline so fast that it does not matter. Anything that eats coralline is a friend of mine.