Hello, they are golden dojo loaches(weather loach). I have 2 females(round pectoral fins)that are about 7".
You may want to feed them boiled deshelled peas & raw cucumber once in a while to help w/swimming issues(prone to constipation because of body shape). Can live 8-10yrs. Temp 62-72° in kept in higher temps. will cut life span in half. Hope this helps!