My female platies (I have two with one male in a planted 10 gal) who seem to have been pregnant since I got them still haven't given birht...but today they were both acting wierd, kind of hiding. and lieing on the bottom of the tank. Almost seemed like they had or were giving birth, but I can't find any fry.....Maybe they were all eaten already? Also they have long sort of stringy waste trailing behing them..placenta? anyone had thishappen? is it normal, or a problem.,......This is my first time owning livebearers, so I don't really know what to expect. please help 