1st. airpump stops and back siphons a 35 gallon hex killing all the fish. o, did i mention it was on the second story?
2nd. baby sister messed with heater dial, killed flowerhorn, tiger shovelnsoe, rtc and rtcxtsn.
3rd new 280 gallon all glass hexagon tank sprung a leak. in one of the corners the silicone split about half way down(9inches) and 140 gallons went on the floor
4th left for three days, no one added freshwater to my 90 gallon reef. first the hundreds of stocks of xenia went then everything else.
5th left tanks in the hands of the parents when i went to college and they failed so bad my 10" gold flowerhorn and american alligator died. how do you kill an alligator you ask? feed it all thirty goldfish at once so you don't have to feed it again for a month. actually, we never had to feed it again cause its sides split open.