Hello, I'm a new tropical aquarium owner. My parents use to keep them when i was a kid and recently i made the decision to get a nice 20 UK gal tank. Well anyway, I bought 2 female Dalmation mollys from the pet store, both looked well and not pregnant. On the first day in my tank both were fine with each other, on the second day, one of the mollys looked larger and seemed very territorial with the other molly, didnt care about any of the other fish. I noticed occasional odd behavior while swimming, she was slow apart from when chasing the other molly lol. They have been in the tank 1 and a half weeks, I cant see any gravid spot because of the mollys colourings, but after reading on here about behavior, i assume she is pregnant. Yesterday she would not leave the heater alone all day, the second i turned the light off, she left it and went down under one of my ornaments and sat there for a couple of hours. Could this be her looking for a safe place for the fry? So today I went to the pet store and got myself a breeder net and placed her in it, does anyone have any idea of how long it will take for her to have the fry? seeing as i have no idea how long she has been pregnant, is it ok to keep her in the breeding net for long? Thanks for any help, Ben.