I have a tank that used to have 6 zebra danios and 2 bristle-nosed catfish in it. I added a rainbow shark to this tank, a few weeks later my 2 bristle-nosed catfish died one after the other, and then the zebra danios started disappearing. I'm now down to 3 zebra danios and think the shark might be catching and eating them. In my other tank there is an albino rainbow shark that hasn't eaten any of my tetras. I was wondering if I should move my last danios to this tank and would the rainbow shark start going after my tiger barbs if I did this?