I have both rose lines and balas in my tank as well. I recommend either as well. They should be okay as well if you get the balas smallish and grow them together. Balas also can get impressively large and do better in groups so be apprised
Love your fish.next on my list these barbsI have Dennison barbs in with cardinals and rummies and they never bother them. My Dennisons are about 5-6".
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Bala sharks would be another possibility.
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I have both rose lines and balas in my tank as well. I recommend either as well. They should be okay as well if you get the balas smallish and grow them together. Balas also can get impressively large and do better in groups so be apprised