Hmm I don't think it is either of those, they don't have the spots like the first one, and they are very dark. They have a stripe down the center of their bodies, and then a little bit of yellow on the top of their dorsal fins. They seem to be growing very slowly as well, do you think it's possible they're some weird type of shelly? They are in my ten gallon right now, will be going into my 36 within the next couple of days. I'm afraid at this point if I put them in there they will get lost Lol. Thanks so much for helping!