I bought my RTG at 12" and he had very red fins and an almost air brush look on his scales as the gold and black strip on its back are coming along nicely. Roughly how big is your arowana? I've had mine for 4 months and is now closer to 14". From what i know the more metallic the scales are on a young RTG the more dark gold the scales will be as the fish grows. My arowana also is 14 months old..