I live in india, here we have a lot of sellers for marine fishes and i usually bought fishes from him as he had the best price and good collection of fishes and corals.In my tank, the corals did absolutely fine, there are some gonis,hammers and zoas but for weird reasons all fishes, especially tangs just die within a week or two for no reason, they ate well, yet they died, no parasites also parameters on mark.finally i took a dead fish out and thought what is the problem, suspecting cyanide poisoning, i gave it to a lab near by to test it and found it was poisoned,from there i ditched that seller.But to be honest,the seller doesn't know how its caught and it goes to the collectors.What your call on this guys?