Biggest mistake was into this hobby, can't and no way out.
If I could +100 this! Using someone else's sand put me in a bad condition I'm currently dealing with (even though sand was washed...)Do not reuse sand!!! It took me 6months to get the nitrates in control!
I was doing 50% water changes weekly for months....and still had "blood red" after 4months
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My biggest mistake was using api test kits for the first year and a half