My Gold Lined Rabbitfish has been with me for 3 1/2 years at this point. I'm always impressed by how quickly he can change color to blend into the background. At a true 8" he's the biggest fish in my 350 gallon. I have an orange shoulder that's slightly smaller and picks on him at times. The Rabbit flairs spikes and gives him a half a lap chase and that ends it.
Other tank mates include Cleaner shrimp, chromis, anthias, banner fish. copper band butterfly, flame fin tang (jerk), blue tang, sailfin tang, chocolate tang, clowns, aptasia ignoring file fish, kaudern's cardinals, sleeper gold head gobie, and a bi color blenny. The only coral I have is a huge bubble coral (BECAUSE I KILL CORAL) tank also houses 2 bubble tip anemones and 2 rock anemones. There is also a brittle star, pin cushin urchin, various snails, and varoious hermit crabs.
Other tank mates that he lived with ,without issues, but I've killed over the years include royal gramma (refused food), fire fish (vanashed), Scissortail dart fish (jumpers all of them), goat fish (jumped), yasha gobies (eaten by wathman gobie), and the forementioned watchman gobie (I don't know why he died but I hope it was yasha poisoning).
I can not speak to any issues with clams as I havn't attempted to murder, er, I mean keep any at this point. I do feed my tank clams on the half shell so I fear I've trained them that clams are a good food source.
He's a model citizen of my tank. I wish I had tried for 2 when I fist got him. I fear that ship has sailed long ago as I don't think adding a new one at this point would end well.
This in my opinion is a fish you should have in your tank. Hope this helps
Purchase size was about 1 1/2 inch. Hope this helps.