Drunk fish.

[fishtankfish]

I have three balloon bellied mollies in my ten gallon tank. One of them is swimming around aimlessly like he is drunk. He flip flops around upside down and everything. The others seem listless but they arent swimming strange. Whats going on?

 

[QTOFFER]

The 'drunk' molly seems to have a swimbladder disorder - could be constipation or a bacterial infection. I would remove him to a hospital tank, if you have one, so he doesn't pass an infection to the others.

The other fish seem to be suffering from something too.

Check your water parameters (ammonia, nitrite, nitrate).
Is the tank cycled?
How long have you had these fish? They may have been sick when you bought them.

 

[illuminum]

Check your heater and make sure that it is plugged in and properly set. You may have accidentally unplugged it. Happened to me once a long time ago and had that same "drunk fish" behavior.