usually if they have a support system, things get better...
I have a couple fish, that are pretty schizoid... both Tin Foil Barbs, & Silver Dollars are known to freak out... having a group big enough can be challenging, as both of these are larger fish... I have 5 Tin Foil barbs, as that's as big a group as I thought I could fit in the tank, & IMO, that is a minimum, as I still see them get freaky once in a while, & I've had them a little over a year... Silver dollars don't get quite as big, & in another tank, I have 7 of them... & in 6 months they are a little better than the tin foils, probably because of the bigger support group... in reality, some fish never get totally comfortable, but if they are going to live, they, or we need to find a way to do needed maintenance & keep their scales on...