I purchased a small goldfish at the petstore recently. It's probably about 2 inches in length. It has the triangular body build of a ryukin or a fantail. Yet is has a single tail. It doesn't have the paired tail fin that you see on most fancy goldfish. Does anyone have any idea what it might be? I...

I had a cloud prob in a 90g tank for months. Used floculants and floss, nothing worked. Had two filters running, Emperor 400, and Fluval 304. I bought a HOT. In the first couple hours, the tank was cleaner than it ever was, next day, polished like the first day I set it up. Ran it for another two...