Not researching the fish / tank size etc, prior to purchase. Overstocking , adding all the stock to soon, underfiltering, and of course ,,,,, impulse purchases,,, all hard lessons that hopefully will be learned from....
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Most of mine are stupid errors. well they make me feel stupid anyway.I once chose not to unplug my heater before doing a water change because I thought I wouldn't be removing that much water. Yep, you guessed it - CRACKLE POP! I never moved so fast in my life to get my hands out of the water. (I really should have known better.)
I will now never forget to unplug everything when doing water changes.