Yet another "What is this whiptail?" question...

[Fallen_Leaves16]

Feels like all I post are these sorts of questions. Anyhow, got another whiptail species I'd like some assistance in ID'ing.

None of them are very good pictures, and I apologise for that in advance. Picked up a trio in hopes I can get them to spawn (I think I have at least 1m/1f, but I don't know for certain); might go back and grab either one or both of the remaining specimens if they're still there. There was a much darker-coloured specimen, but as it was visibly emaciated compared to the others I thought it best if I didn't get it. Labeled "crying whiptail" for some reason. Wild-caught, but I was unable to find the origin. Seem to be nocturnal for the most part; during the day they seem to spend their time partially buried in sand. About ~20-25cm TL. Don't really seem to care much about anything; have observed a pleco accidentally mouthing one's head after an errant pellet fell next to it with no reaction from the whiptail, except an irritated flick of its head.
All three seem to be in decent health, surprisingly; they haven't shown any interest in taking bloodworms yet, but it's only been a day since I had them.

[Fallen_Leaves16]

Forgot to mention, I'm 90% sure they're Rineloricaria, and my best anecdotal guess would be formosa, though having little experience ID'ing I'm probably wrong.

[Fallen_Leaves16]

I had three people say they agree with formosa; I'm gonna go with that for now. At least one feeds on cucumber seeds late at night, but I've never seen any of them eating during the day. Funny little blighters, but enjoyable ones nevertheless.

[bekateen]

I was going to say

Rineloricaria formosa

also. I think that's a good ID.

Cheers,
Eric