Your Jag will be fine! My Jag ate three 2 inch Danio's in one day. At the time, my Jag was 5 inches long. I had two 4 inch Danio's left, took them out and replaced with 5 silver dollars the size of a silver dollar coin. The Jag killed one but didn't eat it and the 4 silver dollars that are left aren't bothered by the Jag, for over a month now.Oh, by the way, I have an 8 inch Jack Dempsey and a 7 inch also in that same tank and they don't even bother with the silver dollars, too wide as opposed to the danio's I guess, to fit in their mouths.