I have a 37 gallon south american cichlid tank with a 9'' quetzal cichlid, a 5'' red headed severum, and a 3'' parrot cichlid.I purchased a 3.5'' tinfoil barb as a dither fish 5 days ago. This morning, he died from my cichlids harassing him. He had torn fins and missing scales. Anyway, what would be a compatible fish that would bring the cichlids out, but wouldn't get picked on?