those lizard tetras…

[Magnum Man77 191]

mine are doing fine, they are a top water fish, at least mine are, hanging with the marble hatchets… being a top fish, I’d expect them to be at least as good a jumper as the hatchets are… they are long slender peaceful fish, that don’t really hang with the other tetras, preferring their own company, or the hatchets… the hatchets seem to prefer the roots along the top edge, with the lizards preferring more the open water in the center…

hard to photograph in this tank, because if all the shade, but there are 3 in this picture, 2 are more blurry, as they are active, the one in the center is most clear

 

[GaryE37 35]

Mine never jumped, but as they grew, they developed really muscular flanks. They stayed slender, always, but they were obviously quite powerful. So I think if they were startled, they could launch. But they are also strong swimmers and very fast, so they might outrun their problems.
Looking at the other tetras and comparing, yours are still very young and will grow a fair bit.

 

[Magnum Man77 191]

there is one that is about 25% larger than the others, and it seems to go back and forth between the main tetra shoal , and this group at the top