Yeah that's what I thought too. But from what I learn online seems like serpa tetra are a little "fatter"? I mean the distance from topfin to his bottom. And this fish seems to be thinner. Is it because the fish is not fully grown?Serpa tetra if I remember correctly.
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Yeah sorry for the unclear pic. I took some close up pics. I looked up for dwarf rabbits. Could be both really hard to tell.Catch the fish and take a picture of the fish in a smaller container so you can get closer.
One way to do this is to trap the fish against the side of the tank, for example in a net or a cup. Not squishing the fish, of course, just keeping him from swimming away.
Take lots of pictures, then sort through them. You want a picture of the side of the fish, and as close as you can get.
The fish in these pics might be dwarf Rasboras, too.