Im not to sure on the crushed substrate really. I know most wrasses that will be of any help usually need to go into the sand. People have been able to keep these fish in bare bottom tanks by just adding a little container of regular sand for them to go into at night. If it was me, I would probably put a container of sand in as well, and give the fish the choice. If it doesn't like your sand it will go into the finer stuff. I was also told they didn't like fine sand like my black sand. But they seem to have no issue with it at all. Also wrasses will pick at feather dusters, bristle worms and some snails. But the good out weighed the bad for me. Thats just my opinion though, I'm by no means a fish expert.
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