Thx for the info, well I thought it could be something with the light conditions. Because when I only switch on the sera plant light, which is not that bright, they seem to scare less. But when I put on the sera blue sky, they seem to be scared more.
Though when I put both lights on at the same time, they dont seem to be scared at all, only when I make a sudden movement. So its a strange case.
The lights are on +- 10 hours a day.
I also added a piece of driftwood, to create shades as u can see on the pictures. I also wrapped foil around the sera blue sky lamp, to create even more shades.
But it seems this isnt helping, so I guess ill follow your advice and keep the lights to a minimum. Ill try to find some quick small fish, that wont be eaten.
EDIT: about that confidence, its mostly the JD that goes hide the first, and when she does, the others follow her

The JD is the most scared of em all.