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Prolonged power failures, heaters sticking on, stray current in water, kalkwasser overdose, running too much GFO too fast, adding "old" water conditioner that has changed composition, animal dying without removal, skimmer overflowing causing ATO to flood tank with fresh water, stirring/disturbing deep sand bed, macroalgae going sexual...
I'll be following the thread. I'm sure there are many more! I wouldlike to see people post their experiences (especially off-the-wall ones) and what methods they now use to prevent a recurrence.
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