I resealed a 150 gallon with silicone that was not for aquariums, it blew up a week later, I came home to find the front piece of glass gone and all the fish all over the floor, I'm still paying for the repairs in the apartment below me.
Three or so weeks after that I got renters insurance and was emptying my new ACRYLIC 125, and I decided to take a quick bathroom break, then I decided I would check my email, then I realized that I was siphoning into a bucket! 75 or so gallons through the floor again.... The guy downstairs would have killed me if he was'nt so scrawny...
Then theres the time I plugged in my heater and O2 and powerhead where my one year old unplugged it, I don't know how long it took but my perfect 13 Inch indo dat was dead, my 14 inch jardini died an hour later, and all 23 of my 4-9 inch loaches wher upside down on the bottom, but they all pulled through.
Leaving a 210 outside full of water to have it freeze and break the top plastic support.
Filling a tank with a plugged in heater only to have it explode due to temperature difference.
Putting 1 inch loaches with a six inch vegetarian koi... I guess he wanted some protien, because all 3 loaches were gone by morning.
Putting a 6 inch Silver arow with 2 14 inch gar, it didn't take to long to realize that was a dumb move.
Adding three 6 inch datnoids, 2 7 or so inch loaches, 1 12 inch distachotas sexfaciatus, and a 12 inch flag tail to an already crowed 72 gallon bowfront. Woke up in the morning to five dead datnoids, 6 dead loaches, 2 dead peacock eels, 1 dead sexfaciatus, a few dead catfish, a dead flag tail and to think, I just spent 300 bucks on most of the fish that week.
Siphoning out my window only to find out that the guy downstairs had his widow open and the water splashed on his windowsill and into his house.
And a bunch of other random stuff... Hope you have more fun reading about it than I had paying for the damages over the years.
Oh and not buying an ST a guy was trying to sell me for 80 bucks at 12 inches, instead buying his 22 inch clown knife for 40... WOW I really feel stupid now.