well here is a belated update. Speck is now named Spot. The gray iridescent fish passed away a few days ago. The third fish is doing fine but still doesn't have a name.
The gray iridescent fish was a bit more bloated looking for about a week before her death. I cut down on feedings in case that was the issue. She was doing and acting well right up til the day she died. I believe she only suffered a few hours.
I was worried the other 2 girls would start fighting since gray fish was previously at the top of the pecking order so the next day I went out and bought 2 more girls. I would have gotten 3 but my store only had 1 inexpensive fish and the rest were $22+. I bought the inexpensive girl and one expensive girl. The inexpensive one is still a baby; she is very small and still has stripes. She is an iridescent blue that looks purple in most light. The other is a marble koi betta. She is mainly red and black on her back and white/yellow on her belly and face. She has a few iridescent scales scattered about.
I was worried on how they'd settle in but everything went incredibly smooth. My 2 original girls were very welcoming of their new tank mates and the 2 new girls were very respectful of their elders 😂. By that I mean: I didn't see a single flare from anyone and they all just swam around in peace. Considering how smooth everything went, I might go get another girl for the tank.