I am not a fan of it.
What type of carpet ? haddoni or Gig?
In the past (( and right now while I am waiting to sell it )) I have mixed LTAs and Haddonis, and each time they would both start to move --- even with running carbon. The day one was moved to another tank they would settle down.
I have also done BTAs and Haddonis, while the moving around wasn't as bad as above, it still did happen. Once I sold off all my BTAs the Haddoni looked so much better -- with no other changes to the tank.
If you are thinking about a Gig, that really wouldn't work (( IMO )) since they prefer to be on the rocks, which is the same area as a BTA.
As for a Haddoni, they get huge, even with them being on/in the sand at the sand/rock interface, their oral disc will still most likely be up against the rocks and could come into contact with any BTAs in a smaller tank.
You can see in this picture how high up against the rocks my haddoni gets. And this was shortly after a water change, and it had actually closed up a bit.