The Sewellia species are a mess to identify if you aren't familiar with the species. Almost all are sold as "reticulated hillstream loaches" or S. lineolata. Your largest loach is indeed a true S. lineolata.
Medium sized one is the most interesting: it could be either S. breviventralis, SEW03 or SEW04. SEW04, least likely. S. breviventralis most likely. S. breviventralis is critically endangered, and your's is a female. If you can find a male and breed them it would be awesome.
Smallest is almost certainly a SEW01.
You have three different types of hillstream loach. Hope this helped.
