This,Why do you think you are over stocked?
your water tests should confirm one way or another if your Bioload is too much (at least for your water change schedule)
This,Why do you think you are over stocked?
I agree my 90 too and I’ve never had a major issueWhy do you think you are over stocked?
BIO load wise, my 100gal has more then twice you stock. It has been running like this for years. My Cardinals are almost 8yrs (if I can remember when I bought them).