Other than discus (the gold and dark eyed ones..not the red eyes.. ^_^) and rams what fish are out there with expressive large eyes? And some color.
And how many are temperature hardy?
I am sure after the loss of Cookie the rescue discus is less raw; that empty 18 gallon tall is going to is call for an occupant. She spent well over 100 bucks worth in new and used up supplies. So it going to "waste" will not work.
But she really likes discus....
The only other animal she pines for is reef tank with some tangs and a seahorse in a corner. I think that would fare worse with our current power situations. Not mention she has to give up more betta time and money to the care of a reef tank.
"Fish! Thank You! Oh, tropical huh? Did you buy a heater? Auuugh!"
Mega-pet stores prolly should not be allowed to sell animals as retail "items".