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Carbon dosing will bring down nitrates much faster than phosphates. Run some GFO for phosphate removal with little to no impact on nitrates. Use GFO and carbon dose to bring both down.
IMO a 30g system would benefit more from a 15 gallon WC. You'd instantly cut nitrates and phosphates in half.
New system will be plagued with gha for a while is started with new dry base rock. It's leaching phosphates. If this is an existing system you need to know where the nutrients are coming from or the algae will just come back. Most likely from over feeding.
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90g Mixed Reef
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