With that stocking level, I would expect to see some nitrates. I would just test weekly just to make sure no funny business shows up. It's a good habit to have in the beginning.
Algae scraping is fine, I like to do a big water change after a maintenance session. Maybe it helps reduce the spores I released from the scraping?
Do yourself a favor, grab a cheap 10 gallon tank, with a cheap filter and air stone and run it as a quarantine tank. I medicate all fish coming into the house no matter what. They are watched for 30 days before entering my display tanks. It solves so many headaches. I've reduced fish deaths significantly, nearly 100% survival rate.
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