Sorry this isn't a cactus

[kikithor]

But does anyone know what this red stuff is? It looks bright red irl. I only noticed it today so it must be fast moving. I brought the pot away from it's usual spot to my bedroom so it wont spread to my others guys I got this plant at ikea in the summer and it's been fine until now.

[iann]

Doesn't look good, but I'm not familiar with this plant so maybe it is normal or harmless.