I haven't bred loaches before but would expect loach fry to hang around the bottom of the tank not around the top like these guys seem to be. I would pick one of these guys neons, glowlights, diamond tetras or danios, the danios are the easiest to breed and the hardiest..
It will be interesting to see what they are as they grow, can you catch them and ensure their survival?
Would be an interesting poll - Guess the fish