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[Marlin65]

Your cycle is just starting. The brittle stars are a good thing.
Just wait another two weeks before adding something else and you should be good then. Only bad thing happen fast in salt water so go slow in adding anything. 82 is OK but at the upper end.
Before adding fish add some cleanup crew ones your algae stage happens.
You will go through a few stages of those brown then green then you get your coraline.