Is guppy pregnant or is it something else
I purchased my female guppies about 3 weeks ago and this one her belly is huge. I can't tell if she is pregnant or not. She swims around a little but mostly stay at the bottom and seems to be breathing faster than the others. I have them in a 5 gallon tank the ph is 8.2, ammonia 0, nitrites 0, nitrates 5.0. There are 4 female guppies and 1 nerite snail. Any help is appreciated.