I have an RBTA and GBTA in my mixed reef. I have them isolated on their own rocks away from the main aquascaping. So far I've had no real trouble, one of the times my GBTA split it let go and floated to another rock. I was able to get it off (gently) and then placed it back where I wanted it. I believe that carpet nems tend to like it low in the tank with their 'foot' in the substrate. I had one for a while but unfortunately it caught too many of my fish and had to go.
HTH
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