Figures, one I didn't mention. It's some kind of fuzz algae. Are these microswords new? If so, I would clip the old infected blades off as new blades sprout up, with new plants there is a greater chance of handling damage which releases nutrients through the cell wall and encourages localized algae growth. The worse off blades seem to be partially emersed growth as well, which is the usual with commercially bought miscrosword, these emersed blades can't adapt to submersion and need to be replaced by new submersed growth anyway, they are probably dying off during acclimation and the alage is there to reap the benefits.
Also check your nitrate and make sure you aren't missing any(this is a low tech tank with no CO2 and ferts, right?). I would also start daily Flourish Excel dosing, this should have a double wammy effect as it encourages outcompeting plant growth and contains gluteraldahyde which is an algaecide.
Fuzz algae can be a tricky one but if you attack it from a few different angles, and make sure there are nutrients available for plant growth, it usually goes away eventually. Sometimes, clipping infected leaves is enough, sometimes it takes more effort. The overall balance of the tank can have a lot to do with it, so it could also be a new tank thing for you. I have a bunch of it in one of my tanks right now, it's balance has been all out of wack since moving it to a new address, and tearing it up for a complete rescape recently.
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