Layer mask with a specific colour

I am trying to do this:
One layer (layer 1) should be masked by another layer (layer 2). I can do that with ‘Layer mask fx on layer 1’.

But I only want the red colours in layer 2 to reveal layer 1. I can’t wrap my head around how to this.

Can anyone help?
Br, Donleavy

Use the chroma mask on layer2 , set the red color. “Layer fx → Masking → Chroma Mask”

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It’s kind of working, but not quite. I tried this before, but forgot the ‘applyAlpha button and I was confused by the fact that white always masks.

Layer 1 FX: Layer mask from layer 2
Layer 2 FX: Chroma mask with red colour.

Green always masks in this setup, for some reason. I don’t quite understand.

chroma-mask 3

Does anyone know what the problem is? I don’t get it.