What is the name of this fish?

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I wouldn't be so sure that that's a yoyo loach. Its patterning does resemble a young ladder loach to some degree (second picture): https://www.loaches.com/species-index/botia-rostrata
Do keep us updated as it grows, if possible.

Deadeye is right, all Botia loaches do best in groups of at least 5 or 6. Yoyos and ladders included, so if you don't already have at least 4 or 5 more, that many more should be purchased ASAP.
And yes, I would expect this species to eat snails as well.

Good luck and enjoy the fish. Botia loaches are excellent species to have.
Here is a quality guideline written by Loaches Online on their general care: https://www.loaches.com/articles/an-introduction-to-keeping-botia
I agree with the yo-yo loach statement. The way the pattern has 3 spaces is definetly off. Although I am no assurance to loach keepers, something doesn’t look right.
 
Did you get more?
Thank you! Yes, I did. I got 4 more , so total I have 5. They are not shy and they hang around the amazon puffers all the time. They are very active as well. Two of them hang out in another corner of tank and three with the other corner. All 5 of them do not stay together.
Also something strange I noticed, the amazon puffers are sometimes during the day are glass surfing, and the loaches started copying the amazons, they do exactly as amazons. Whatever they do, like glass surfing, the loaches do the same. Not sure why this behaviour.

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I agree with the yo-yo loach statement. The way the pattern has 3 spaces is definetly off. Although I am no assurance to loach keepers, something doesn’t look right.

Confirmed to be ladder loaches.

It should be noted, however, that species ID when a loach is young isn't easy. The pattern of the fish changes as it grows.
 
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I'm very happy I was of help. Here are some more tips, taken once more from 'An Introduction To Keeping Botia'.

-I'd advise to change the substrate to sand, and if not possible, fine smooth gravel. From the article:
The substrate should consist of either inert aquarium sand (my preferred choice) or fine smooth aquatic gravel. Anything sharp must be avoided to protect the delicate sensory barbel area. I have seen loaches which have been kept on coarse gravel for several years with very worn-down barbels; it is a sad sight to see and is so easily avoidable. In some cases, particularly if the gravel is not kept free of detritus, the sores on the barbels can become infected.
You have kuhli loaches in that tank as well if I remember correctly, and if I do remember correctly, they will also benefit from it.

-The glass surfing is actually something called loach dancing. What you are seeing is the part where the loaches swim up and down.
A common trait of newly introduced Botiine loaches (or if you change the décor around in an existing tank containing loaches) is for them to perform what is nicknamed by loach enthusiasts as ‘The Loachy Dance’. This is where they appear to dive bomb in a shoal, up and down at the sides and corners of the tank. This usually settles down within a few days as they get to know their new home. However, it is not likely that the dance is always a stress reaction, as loaches have been known to do this even in tanks that have been set up for years. I regularly see my shoal of forty Clown loaches doing this in the evenings under blue moon lighting. They usually perform their dance when it is getting close to feeding time, and they are very obviously excited. I feel that in this instance it is more of a social bonding behaviour, each one bumping into others and letting them know they are there – they seem to feel happy and safe under such circumstances.

Based on the circumstances, I'd suspect that this dancing stems from the fact that the loaches are new. I can't say just why they might be doing it with the puffers though - perhaps, based on behavioral similarity, they choose to join the puffers?
 
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