I think it would add a little bit of humor to the forums if we had a threat for the "Biggest" Newbie mistakes. I mean come on guys, if you are having a rough night you can log on here and read what all the morons have done, just to make yourself feel better from others misfortunes.
Heck, I'll Start!
I was cleaning out my 10 gallon (my first tank, about 6-7 months ago) and I had an Electric Yellow, Jack Dempsey, Common Pleco, and a Black Convict. Yeah a strange variety, but they seemed to get along! And when I was cleaning it out I noticed I had a lot of hardwater stains on my AC 150 lid. It was like even my water was covered in hard water stains. So anyways, I unplug and take my filter over to the sink, and I cleaned the ENTIRE thing out... (Note this is after running the gravel vacuum over every square inch of the place) I cleaned the filter media and all...
Couple days or maybe it was a week later, all my fish died... Musta cleared out all the healthy bacteria.
Heck, I'll Start!
I was cleaning out my 10 gallon (my first tank, about 6-7 months ago) and I had an Electric Yellow, Jack Dempsey, Common Pleco, and a Black Convict. Yeah a strange variety, but they seemed to get along! And when I was cleaning it out I noticed I had a lot of hardwater stains on my AC 150 lid. It was like even my water was covered in hard water stains. So anyways, I unplug and take my filter over to the sink, and I cleaned the ENTIRE thing out... (Note this is after running the gravel vacuum over every square inch of the place) I cleaned the filter media and all...
Couple days or maybe it was a week later, all my fish died... Musta cleared out all the healthy bacteria.