This morning I woke up and I found one of my two zebra danios laying on the bottom of my 10 gallon tank not moving but it looked like it was breathing really fast. I went to get a closer look and she got scared to she tried to swim away and she just floats with the current. She can't move anything besides breathing and when she was "swimming" every few seconds it would look like she's having a seizure please help I have a topfin 10 filter with my heater set at 76 and I started cycling my tank four days ago