Could it actully be algae & the white stuff/dust/bacteria is just sticking to it? Does the white come out of the filter or does it appear when you pour the water in? Does it appear gradually or suddenly? I think it might be something (a mineral maybe) precipitating out of the water column or...
Look up Lymphocystis; that & the white head can both be signs of stress.
Can you tell if it's fuzzy on the rasbora? If so it's probably columnaris, as fungus is more common in dirty tanks, but it could be either on stressed fish.
See if you can get reminralized RO water from a fish store & use...
I haven't delt with them myself, but I've read that medicated food (fenbendazole or levamisole) is the most effective way to treat camallanus & capillaria because the worms are in their digestive tract & the fish don't drink/absorb enough medication from the water to really do anything.
If you have a quarantine tank & no other fish have symptoms then separate it, otherwise treat the whole tank. It is cheaper & easier to treat in a 5 or 10 gallon quarantine tank. If you haven't read it already you should read the columnaris article.
If you do end up separating it maybe treat all...
More questions:
How many days have you had the rasboras?
Do you vacuum the gravel, if so how often?
What temperature is your tank?
I'm thinking it's columnaris not fungus.
Have you tried leaving the CO2 off for a few days? Or using more/different brand of minerals? Your KH is at the low end and that is the one that buffers pH.
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