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I believe it's dieing for some reason. If it's new LR that is pretty common. Another reason is a change in lighting. I'm sure there are many more reasons but those are a couple I can think of.
That`s a good idea. It is low. If the PWC does not do it, add some Kent`s coral builder. It is good for corraline algea. Some times PWC are not enough depending on what type of Salt you use.