The tetras could be a number of causes but since they have stabilized that's not a problem now.
The algae on the glass is something I get too from tanks near the window, not neccessarily direct sunlight too.
It seems the ambient light is very strong and enough to cause algae formy tanks in such locations.
One easy way to remove them every now and then is to use an old plastic credit card and scrape it away.
I usually do this before a water change too.
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