Heniochus Black & White Butterflyfish
 

Hey,

All the sites on the internet say this fish is not reef safe but do not explain why. Can anybody tell me why?

Thanks

Heniochus Black & White Butterflyfish
 

Just checked Marine Fishes and it only says they can be destructive in a reef. I'd assume that they pick at coral polyps considering their family. Heniochus diphreutes looks close enough to H. acuminatus (long fin) (enough that I'd be careful when purchasing), stays a little smaller and is safe. HTH