Hi and welcome to the forum
It's not a baby loach. It looks like a baby livebearer (molly or platy). You can feed it on crushed up flake food, newly hatched (baby) brineshrimp and microworms.
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How long has the tank been set up for?
Have you cycled the filter (let it develop the good bacteria that keeps the water clean)?
If the tank has only been set up for a short time (less than 6 weeks), you might be doing a fish in cycle. This simply means there are fish in the tank while the filter bacteria develop. If this is the case, you should reduce feeding to 2-3 times a week and do a 75% water change 4-8 hours after feeding. You should also monitor ammonia and nitrite levels and do a 75% water change any day there is a reading above 0ppm.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.
If the tank and filter have been cycled (takes around 6 weeks), then you can feed every day and do a water change and gravel clean once a week.
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Regarding the loach. They are social fish that need to be kept in groups of at least 6, preferably more. They are matriarchal a a big female will rule the group with smaller males and females beside her. They need a tank that is at least 3 foot long and should not be kept with other bottom dwelling fishes like Corydoras catfish. They like to shelter during the day and come out at night.
If the aquarium has cycled, then add some more loaches.
If it hasn't cycled, wait until it has finished developing the beneficial filter bacteria and then add some more loaches.