Warning: never let your roommate 'help' with your aquarium while you're gone
I came back from a 4 day work trip to find my 20 gallon tank cloudy and my roommate had dumped a full bottle of bleach in it because he thought it would 'clean the algae', and after I flushed everything and lost 3 fish, he asked why I was so mad, so has anyone else dealt with a roommate who thinks they know water chemistry?