Unfortunately true. Many don't do well.
FWIW, I had one with clams and LPS and SPS. You can take to the bank they won't bother SPS. Clams are hit and miss, some people have issues keeping them with clams, but mine never bothered my clams even though I fed it the occasional clam on the half shell. Mine did bother Acans and Blastos though, I ended up not being able to keep them, and yellow polyps too, a whole colony lost.
Mine lived for just under 3 years then died very suddenly one night back in the spring of this year.
