I'm the one who said that thing's not a brevis. He texted the pictures to me as we where chatting about them.
Your fish is the traditional vittatus. The person from whom you were buying the fish had the ID backward; they were selling the brevis as VATF and the vittatus as BATF.
Well I had posted a reply but I have no clue where it went.
Anyhoo, lets do it this way:
I'd like to use your fish to further my knowledge base. I diagnosed it as a vittatus because it is nothing like the fish that are currently accepted in the hobby as brevis. However, the brevis / fatf relationship is something that I'm currently exploring. The available data is sufficient to firmly diagnose the suspected brevis that people keep, but specimens that are well enough photographed to examine are few and far between.
If you can provide a clear picture that clearly shows the scales between the lateral line and the pelvic fin, another picture that allows for the counting of the lateral line scales and finally, a third picture that shows the adipose fin we'll be able to get you a 100% firm ID straight out of the academic data.
One of two things will happen. Either we'll confirm it as a VATF or we'll get a valuable new piece of info in the quest for the truth of brevis. Either way, we all win.