r/Planted_tanks_India

Need a bit of help, i set up this tank about 40 days back been changing water and maintaining bacterias also, added a betta yesterday he died in a day but i also added shrimps they seem to be doing good, found few veryy thin worms white color cant click picture in mobile theyre very small and theres more than a 100 for sure if i look closely they keep moving around there and here. Can you guys tell me what can be the worm in my tank be?

So I got a few sub adult cherry shrimps and they have vorticella. And for the salt dip I can't find aquarium salt or so. The closest I have gotten to find something is this salt. Should I use this or not and if I should. I have one berried shrimp too. What about her?