100% Certain This is a Dojo/Weather Loach. Don't up their numbers, keep it alone, they don't mind, but khuli loaches do. Dojo loache get gigantic, so you wouldn't have enough room for a lot of them even if they did prefer company.
While I usually agree with you, onidrase, in this case you're wrong! I do agree that the OP doesn't have room for more, as they do get to about a foot long, but weather loach
do need company of their own kind; he really won't be happy on his own.
Look like glofish to me, which are basically dyed zebra danios. They should school with the other zebra danios if you get them, but I personally find the idea of glofish to be a bit dumb and cruel. How they come about is the eggs of zebra danios themselves are dyed different fancy colors, and then they give the fish a copywrite and sell them for outrageous prices like they're the next big thing.
Glofish aren't dyed, they're genetically modified, a totally different thing. The fish don't suffer in any way, so I'm not sure it can be considered 'cruel' as such. Whether you agree with GM or not is another matter...