she has been like that for 3 weeks?! im surprised she has lasted that long, what are your water parameters? how often do you do water changes? i dont know what it is but its definitely serious and needs to be addressed immediately, let us know all the details about your tank and routine and if there was anything that happened around the same time she started doing this. but i think its something with your water because all of your fish were laying on the bottom and unless its midnight and you just turned on the lights and they hadnt woken up yet they shouldnt be laying on the bottom like that at all, and all of there colors are super stressed looking