The specimen of E. merra looks it has a saddleback syndrome as the anterior part of the dorsal side is looks flat. If you are interested, we can collaborate to describe this case of anomaly after full examination. No cases of abnormalities have been reported for this species before.
think the scientific name of the 3 fishes that identified by Dr. Ronald Fricke are 100% true, you can input those species names in the www.fishbase.org and you can see some pictures of fishes that similiar with yours.