Yesterday in my 40 gallon tank, i just realized my female guppy was pregant, i moved her to my upstairs 10 gallon tank alone with a snail. She was swimmin happily for like 3 days and today i just cam home and she was near the top of the water, She was shaking, and when i came close to the tank, she swam really fast away from me, What is the problem? Stress?