Well the worst that happened to me was when my dad tried to help me with Co2 needle valve settings, after seeing me struggle with it for a while he adjusted it to get nice bubbles going when I was out to college and I came back home to 80 cardinals , 20 congo tetras and 50+rummy nose, 6 large roseline barbs all dead and floating .
I had collected most of the plants from other hobbyists by doing odds and end , doing thier diy projects , selling ferts/ filters. etc
The fish alone took me a loong time to save up/ beg /recieve in gifts from others.
The ph had crashed to something like 4.
Well we didn't speak for over a year and he still hates all my tanks
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