I was at the FS today and saw the biggest guppies I'd ever seen. More like molly-size. So I asked the guy if they were guppy/mollies and he looked at me like doh! They're always so big when they're adults he said (he WAS quite rude, but hey, so are most FS employees in my experience, so nothing new). So how big do they get (the adults, I mean). These must have been 3in or something.