Is this hair algae or bryopsis?

[Arringar]

It grows in clumps. Magnesium at 1600 for 4 weeks did nothing to it.

 

[JVB89]

Looks like bryopsis to me

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[Arringar]

Is this hair algae or bryopsis?

It looks similar, but it doesn't have the branching structure and growth pattern I've seen in bryopsis in the past. Wasn't sure if perhaps it was just a different variety I hadn't encountered.

Does everyone agree that the Kent marine tech m is the only magnesium supplement that works on bryopsis?