I'm not an expert on the fish, but your tank is looking great. I think a puffer with some gobies would look nice -- I'm a fan of more selective fish stocking. I find many saltwater tanks tend to be more like: I'll have one of everything.
I'd prefer stockings be more intentional -- e.g., for my tank I'm going with a school of chromis and some mandarin's. Low bioload for a macro tank.
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