I would extend that to a blanket 'everything I didn't pay for'.
I break all frags and corals off their base rocks or plugs and throw them away. I aggressively clean (and sometimes bleach) the exposed skeletons of LPS. Rock from other people's tanks/tanks at the LFS are very effective vectors for problem algae, flatworms, and all sorts of other things I don't even know about I'm sure.
Other than that I don't really avoid anything other than fish who include coral as a primary part of their diet. I also won't buy any softies like toadstools because this reef is mostly SPS and I've heard they can go to chemical war.
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