This thing sounds mondo aggressive.
Can you post a picture of the carpet?
The fact that it "splits" is a bit of red flag. It could mean that it is indeed a S. tapetum "mini carpet" but it could also mean S. helianthus which is an Atlantic species (and known to be an aggressive eater). I'm not sure how aggressive tapetum is supposed to be. S. gigantea and S. haddoni and S. mertensii are not known splitters (there are isolated stories of it happening, but generally as exception not the rule).