From my experience in this hobby, algae is going to grow somewhere. That's what algae does. It grows. If your conditions in the display are better suited to grow algae - that's where it is going to grow.
Once I setup a proper refugium, with a proper light and turn-over - I have never experienced algae in my dislpay.
So what I would do in your situation:
Ditch the puck light. Pickup an h380 and setup a proper fuge. Never look back.
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