anyone have experience keeping sharks and fish together?

Hi,
I've had a bamboo shark (now about 15") in my 420 folr for about a year and a half now.
No problems whatsoever.
All of a sudden, over the last couple of weeks, I've lost 3 smallish fish (royal gramma, fridiami pseudochromis, and a spotted sweelips) without a trace.
The shark is the only real suspect.
Has it suddenly developed a taste for fish, or do I need to up my feeding of it?
any help from people with experience would be appreciated.
Thanks
:help:
 
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