Name the feature you see
Hue describes the color family, while opacity describes how solid or see-through the color appears. Coverage refers to how much of the body shows that color.
These observations are not interchangeable. A shrimp can have a vivid hue with incomplete coverage or broad coverage with lower opacity.
Control viewing conditions
Compare animals in the same light and against the same background. Camera exposure and reflections can make opacity harder to judge.
Use simple descriptive notes rather than assigning a numerical grade unless your project defines a clear scale.
Use separate selection criteria
If you are breeding for coverage, record that independently from hue. This makes it easier to understand which trait changed over time.
Avoid assuming that a visual trait guarantees a predictable offspring pattern. Keep parentage and generation notes where possible.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.