Tunze wavemaker magnets. Is this rust?

[gtareef]

Can anyone please tell me if this is rust? I tried to clean it but can't really tell.

Thx

 

[gtareef]

Can anyone please tell me if this is rust? I tried to clean it but can't really tell.

Thx

 

[gtareef]

Sorry. Here is the pic.

 

[mav3rick478]

Looks like it.

Sent from my Pixel XL using Tapatalk

 

[Steve Atkins]

I have a sponge that colour. Is it hard or soft?