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I have had many fish with rainbow sharks (cherry barbs, tiger barbs, otos, cory cats, neon tetras, glowlight tetras, zebra danios...) They all did fine. The only bit of aggresion I have ever seen is with the tiger barbs, my rainbow shark just chases them around to show them who's boss, nothing serious. I don't think rainbows get along well with other sharks, that may be the problem. They are territorial.
P.s. you are overstocked. You should only have about 1 inch of fish per gallon. You have a 29 gallon tank and 51 inches of fish. Rainbow sharks will grow to 6 inches and the bala sharks will grow to well over a foot, about 15 inches. The balas will eventually get too big for most home aquariums.
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