"Plant" ID please

[Guppy10]

Morning all and hope you are well.
A strange plant came with some shrimps, which seems to be thriving. It hasn't any roots and looks more like a seaweed type thing to me. I ask what is it and is it good for the tank ? If so I could use more of it. It's the thing in the foreground next to a bit of coral ( couldn't resist getting happy corys in the pic )

 

[CassCats]

Süsswassertang

A type of moss

 

[Guppy10]

Thanks, is it good to have ? Can I buy it if so ? What do you recommend ?

 

[CassCats]

Its a good plant, but prone to melting.

 

[Bub]

Love these plants. For years people thought it was a liverwort or a moss, but it's actually an aquatic fern. It's also appropriate that you felt it was a seaweed type plant, as Süsswassertang translates to freshwater seaweed, which it does look like.