Im confused about my Mollys

[Shellii]

Hi im only new to this site, i have recently bout a 96L tank with live plants and have gotten some starter fish, mainly neon tetras and some black and orange mollys.....i find all my fish are acting normal apart from my orange mollys,

They are huddled down in the bottom corner of the tank right under the heater, they just hover there endlessly, the other fish come over to look every now an then but generally go off to do there own thing,

they have only been in the tank a day, nearly two.....maybe im just being overly worried....but i dont want any of them to die on me!!

if anyone knows more id much apreciate it