Sorry for "bringing back this thread", I just think thier needs to be an update.
I think it was paracites, thanks kitten_penang! Unfortunately, the day I got the paracite meds, it was too late for my swordtail. The orange Swordtail from the picture has passed
. The tetras are showing improvement. I don't know if Bro (the infected one) is completely healed but I will be watching him.
Thanks for all your responses! I hope this stuff is gone.