I have had mine for over a year now and its doing great. I have tried 3x previously. None of them have picked at any snails, shrimp, crabs, etc...
However, i’m not sure how long clams would last.
I have a ~150 gallon (48x31x24) and she seems to be happy in there for now. As mentioned above they are rather slow growing but I wouldn’t recommend them to anything under 120gal.
I cannot speak for behavior around other Anampses species, but they are moderately peaceful around other wrasses (Cirrhilabrus, Macropharyngodon, Paracheilinus, etc...).
They often come in with intestinal parasites/flagellates so it would be a good idea to soak food in general cure for a couple weeks. Mine started putting on weight after this. A few weeks in quarantine with a tupperware full of sand wouldn’t be a bad idea either.
They typically won’t eat for a couple days after arrival. Live blackworms, masstick, and baby brine shrimp have worked best for me to get them eating. Now she eats just about anything.
It is imperative that they are fed at least 2x a day with high quality foods. Often, without heavy feeding they slowly waste away.
No changes in sex so far and aggression is minimal. Still fat and happy as far as I can tell.