Ok, hans you do realize the care that goes into taking care of those fish right? A 3inch discus is still a very young fish, which at that price is probably a cull from asia, probably footballed. Young discus really need a high water tempature, at least 84 degrees, preferably around 86. To grow properly they need a high protien diet, and most importantly clean water. Frankly I think you are pretty much sentencing the thing to death in a tank with the barbs, who most likely will harass it, adding to the stress already effecting the fish because of being moved and will be very likely to get sick. A bacterial infection would probably be the first thing to effect it. Discus are pretty shy eaters, those tiger barbs will outcompete it every time.
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