It looks like it could be Ich.
Life cycle is after it attaches to the fish and you see it , it grows and drops off to the bottom to reproduce, then it is free swimming to find your fish as a host, and make thousands more, that is why people frequently don't think their fish has it after a couple days. And then it comes back with all the new ones like a blazing fire.
Read this article for further clarification, on when the meds actually can work. Don't give up, and follow directions for length of time dosing.
What are you using?
Freshwater Ich? Yuck! - Aquarium Advice
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New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves
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