The sp. Ampah do look different, I have posted pictures in the past. The filament caudal is developing quite nicely on them now. I believe I have two females and I hope to spawn them.
The sp. Ampah, as well as the latest one in the picture were both sold as “filamentosus”
The second fish also died, the body was almost black and the caudal was a thick, vibrant red color with some black in it.